各位數學大俠們,幫忙解答一道數學題,要快啊!!很急的!!拜托 謝謝啦~~~
等腰直角三角形AOC和等腰直角三角形BOD,∠CAO=∠DBO=90°C,O,D在同一條直線上,M為CD的中點,判斷MA與MB的關系。=
從A.B兩點分別向CD做垂線交與P.Q點
PQ=1/2CD=PM+QM
CM=1/2CD=CP+PM
所以CP=QM AP=QM
同理PM=BQ
<APM=90=<BPM
所以三角形APM全等于三角形MQB
所以AM=BM
香初上午是正解
幫我回答一道數學題 急需答案 急 急 急 急 急 急急急急急急急急急急急急急
1.小菲參加一次英語競賽,一共20題,規定做對一題得5分,做錯一題不但不得分,還要倒扣2分,結果她得了79分.你知道她做錯了幾題嗎? rn2.蘇州市出租車起步價是10元3千米,以后每小時行1千米付1.8元,媛媛和爸爸從家到外婆家共付車費13.6元.媛媛家到外婆家大約有多少千米?(列方程解答) rn3.有甲,乙兩堆棋子,甲堆的棋子數是乙堆的一半,如果從乙堆里取出9顆放入甲堆,這樣兩堆棋子的顆數就相同了。求原來早堆有多少顆棋子? rn哪位能幫忙,請回答詳細些,最好把簡單思路說一下,萬分感謝。在線等。 rn問題補充:因為是小學六年級的數學題,剛學方程式,請簡單些。 rn有一排電線桿,原來每兩根之間相距 米,現在要改成每兩根之間相距 米,如果第一跟不動,那么至少在隔()米可以有一根不移動,這根是原來的第()根,是現在的第()根。 rn小名做了20道數學題,做對一道題得5分,做錯一道題扣3分,結果小名得了60分,小名做對幾道題? rn道數學題,全班40人做對,10人做錯,這道題的正確率是( )% rn1.45+15×6= rn2.250÷5×8= rn3.6×5÷2×4= rn4.30×3+8= rn5.400÷4+20×5= rn6.10+12÷3+20= rn7.(80÷20+80)÷4= rn8.70+(100-10×5)= rn9.360÷40= rn10.40×20= rn11.80-25= rn12.70+45= rn13.90×2= rn14.16×6= rn15.300×6= rn16.540÷9= rn17.30×20= rn18.400÷4= rn19.350-80= rn20.160+70= rn21.18-64÷8= rn22.42÷6+20= rn23.40-5×7= rn24.80+60÷3= rn25.41+18÷2= rn26.75-11×5= rn27.42+7-29= rn28.5600÷80= rn29.25×16= rn30.120×25= rn31.36×11= rn32.1025÷25= rn33.336+70= rn34.25×9×4= rn35.200-33×3= rn36.3020-1010= rn37.12×50= rn38.25×8= rn39.23×11= rn40.125÷25= rn41.4200-2200= rn42.220+80= rn43.20×8×5= rn44.600-3×200= rn45.20+20÷2= rn46.35-25÷5= rn47.36+8-40= rn48.2800÷40= rn49.98÷14 = rn50.96÷24 = rn51.56÷14 = rn52.65÷13 = rn53.75÷15 = rn54.120÷24 = rn55.200÷25 = rn56.800÷16 = rn57.840÷21 = rn58.560÷14 = rn59.390÷13 = rn60.600÷15 = rn61.72÷24 = rn62.85÷17 = rn63.90÷15 = rn64.96÷16 = rn65.78÷26 = rn66.51÷17 = rn67.80÷40 = rn68.100÷20 = rn69.100÷4 = rn70.240÷40 = rn71.920÷4 = rn72.300÷60= rn73.64÷2 = rn74.64÷4 = rn75.50÷5 = rn76.60÷8 = rn77.96÷4 = rn78.90÷6 = rn79.400+80 = rn80.400-80 = rn81.40×80 = rn82.400÷80 = rn83.48÷16 = rn84.96÷24 = rn85.160×5= rn86.4×250= rn87.0×518= rn88.10×76= rn89.36×10= rn90.15×6= rn91.24×3= rn92.5×18= rn93.26×4= rn94.7×15= rn95.32×30= rn96.40×15= rn97.60×12= rn98.23×30= rn99.30×50= rn100.5×700=1)解:設小菲做錯X道題。
2X+(20-X)*5=79
2X+100-5X=79
2X-5X=79-100
-3X=-21
X=7
答:小菲做錯7道題。
思路:對一道題得5分,錯一道扣2分,最后得79 分,也就是說這20道題扣得和得的共79分,那么就可以設錯的題數為X道題,那么口的分數就是2X分,對的題數就是(20-X),那么加的分數就是5*(20-X),讓他們相加和為79就可以了。
(2)解:設媛媛家到外婆家大約有X千米。
X-3=(13.6-10)/1.8
X-3=3.6/1.8
X-3=3
X=6
答:媛媛家到外婆家大約有6千米。
思路:從媛媛家到外婆家共用了13.6元,其中10元錢是3千米,余下的是1.8元/千米,那么先去掉3千米用的錢數(10元),再用剩下的錢數除以1.8,得出的得數(3千米外的路程)再加3(10元走的路程)就可以了,由此得到上邊的方程。
(3)解:設乙堆有X顆棋子,那么甲堆則有1/2顆棋子。
X-9=1/2X+9
X-1/2X=18
1/2X=18
X=36
1/2X=36*1/2=18
答:乙原有36顆棋子,甲原有18顆棋子。
思路:先設已有X顆棋子,甲是它的一半,那么就是1/2顆棋子,如果乙給甲9顆,就相等,也就是說乙減去9顆棋子,甲加上9顆棋子,他們就相等,那么就讓甲加上9 顆等于乙減去9顆就可以了。
問題補充的題:(1)這個...對不起哈...我不會..你可以請教別人。
(2)這道題和第一題英語競賽那個一樣,可以列方程,若第一道題我寫的思路你看懂了這道題就會了。最后答案為15.
(3)求正確率就應該用對的人數除以全班人數乘100%,對的人數為(40-10=30)人,全班人數為40人,則正確率為:
(40-10)/40*100%=75%
答:這道題的正確率為75%。
計算題:1.45+15×6= 135
2.250÷5×8= 400
3.6×5÷2×4= 60
4.30×3+8= 98
5.400÷4+20×5= 200
6.10+12÷3+20= 34
7.(80÷20+80)÷4= 21
8.70+(100-10×5)=120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45= 115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9= 60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70= 230
21.18-64÷8= 10
22.42÷6+20= 27
23.40-5×7= 5
24.80+60÷3= 100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80= 70
29.25×16= 400
30.120×25= 300
31.36×11= 396
32.1025÷25= 41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010= 2010
37.12×50=600
38.25×8= 200
39.23×11= 253
40.125÷25= 5
41.4200-2200= 2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200= 0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40= 70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 = 4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 = 5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 = 40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 = 40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 = 6
64.96÷16 = 6
65.78÷26 = 3
66.51÷17 = 3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 = 25
70.240÷40 = 6
71.920÷4 =230
72.300÷60= 5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 =10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 = 15
79.400+80 = 480
80.400-80 =320
81.40×80 = 3200
82.400÷80 =5
83.48÷16 = 3
84.96÷24 = 4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10=360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 104
94.7×15= 105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30=690
99.30×50= 1500
100.5×700=3500
以后有不會的題可以問我哦~只要我會,我會盡量幫你的。
一.1解:設她做對了x道,那么做錯了(20-x)道,則
5x-2(20-x)=79
x =17
所以她做錯了20-17=3.
2.解:設媛媛家到外婆家大約有x千米(x>3),則
10+1.8(x-3)=13.6 (10元是行駛的3千米)
x =5
所以大約有5千米.
3.解:設原來甲堆有x顆棋子,那么乙堆有2x顆棋子,則
x+9=2x-9
x=18
所以原來甲堆有18顆棋子.
4.這題沒有數據,不好算。
5.解:設小名做對了x道題,那么做錯了(20-x)道,則
5x-3(20-x)=60
x=15
所以小名做對了15道.
正確率:40÷(10+40)=80%
二.1.45+15×6= 135
2.250÷5×8= 400
3.6×5÷2×4= 60
4.30×3+8= 98
5.400÷4+20×5= 300
6.10+12÷3+20= 34
7.(80÷20+80)÷4= 21
8.70+(100-10×5)= 120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45= 115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9= 60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70= 230
21.18-64÷8= 10
22.42÷6+20= 27
23.40-5×7= 5
24.80+60÷3= 100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80= 70
29.25×16= 400
30.120×25= 3000
31.36×11= 396
32.1025÷25= 41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010= 2010
37.12×50= 600
38.25×8= 200
39.23×11= 253
40.125÷25= 5
41.4200-2200=2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200= 0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40= 70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 = 4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 = 5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 = 40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 = 40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 = 6
64.96÷16 = 6
65.78÷26 = 3
66.51÷17 = 3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 = 25
70.240÷40 = 6
71.920÷4 = 230
72.300÷60= 5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 = 10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 = 15
79.400+80 = 480
80.400-80 = 320
81.40×80 = 3200
82.400÷80 = 5
83.48÷16 = 3
84.96÷24 = 4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10= 360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 104
94.7×15= 105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30= 690
99.30×50= 1500
100.5×700=3500
相信我,一定對的!!!!!!
1.做錯3題,對17題
2、10+1.8(X-3)=13.6 解得x=5. 答案5千米
3.18個棋子
設甲有X個棋子,乙就有2x個。
x+9=2x-9
4.電線桿的問題你沒有說清,我無法解答。可以直接在線交談
5、小名做對15題。
1.45+15×6= 135
2.250÷5×8= 400
3.6×5÷2×4= 60
4.30×3+8= 98
5.400÷4+20×5= 200
6.10+12÷3+20= 34
7.(80÷20+80)÷4= 21
8.70+(100-10×5)=120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45= 115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9= 60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70= 230
21.18-64÷8= 10
22.42÷6+20= 27
23.40-5×7= 5
24.80+60÷3= 100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80= 70
29.25×16= 400
30.120×25= 300
31.36×11= 396
32.1025÷25= 41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010= 2010
37.12×50=600
38.25×8= 200
39.23×11= 253
40.125÷25= 5
41.4200-2200= 2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200= 0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40= 70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 = 4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 = 5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 = 40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 = 40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 = 6
64.96÷16 = 6
65.78÷26 = 3
66.51÷17 = 3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 = 25
70.240÷40 = 6
71.920÷4 =230
72.300÷60= 5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 =10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 = 15
79.400+80 = 480
80.400-80 =320
81.40×80 = 3200
82.400÷80 =5
83.48÷16 = 3
84.96÷24 = 4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10=360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 104
94.7×15= 105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30=690
99.30×50= 1500
100.5×700=3500
1.做錯3題,對17題
2、10+1.8(X-3)=13.6 解得x=5. 答案5千米
3.18個棋子
設甲有X個棋子,乙就有2x個。
x+9=2x-9
4.電線桿的問題你沒有說清,我無法解答。可以直接在線交談
5、小名做對15題。
1.45+15×6= 135
2.250÷5×8= 400
3.6×5÷2×4= 60
4.30×3+8= 98
5.400÷4+20×5= 200
6.10+12÷3+20= 34
7.(80÷20+80)÷4= 21
8.70+(100-10×5)=120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45= 115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9= 60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70= 230
21.18-64÷8= 10
22.42÷6+20= 27
23.40-5×7= 5
24.80+60÷3= 100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80= 70
29.25×16= 400
30.120×25= 300
31.36×11= 396
32.1025÷25= 41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010= 2010
37.12×50=600
38.25×8= 200
39.23×11= 253
40.125÷25= 5
41.4200-2200= 2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200= 0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40= 70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 = 4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 = 5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 = 40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 = 40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 = 6
64.96÷16 = 6
65.78÷26 = 3
66.51÷17 = 3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 = 25
70.240÷40 = 6
71.920÷4 =230
72.300÷60= 5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 =10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 = 15
79.400+80 = 480
80.400-80 =320
81.40×80 = 3200
82.400÷80 =5
83.48÷16 = 3
84.96÷24 = 4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10=360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 104
94.7×15= 105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30=690
99.30×50= 1500
100.5×700=3500
1.45+15×6= 135
2.250÷5×8= 400
3.6×5÷2×4= 60
4.30×3+8= 98
5.400÷4+20×5= 200
6.10+12÷3+20= 34
7.(80÷20+80)÷4= 21
8.70+(100-10×5)=120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45= 115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9= 60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70= 230
21.18-64÷8= 10
22.42÷6+20= 27
23.40-5×7= 5
24.80+60÷3= 100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80= 70
29.25×16= 400
30.120×25= 300
31.36×11= 396
32.1025÷25= 41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010= 2010
37.12×50=600
38.25×8= 200
39.23×11= 253
40.125÷25= 5
41.4200-2200= 2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200= 0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40= 70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 = 4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 = 5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 = 40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 = 40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 = 6
64.96÷16 = 6
65.78÷26 = 3
66.51÷17 = 3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 = 25
70.240÷40 = 6
71.920÷4 =230
72.300÷60= 5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 =10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 = 15
79.400+80 = 480
80.400-80 =320
81.40×80 = 3200
82.400÷80 =5
83.48÷16 = 3
84.96÷24 = 4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10=360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 104
94.7×15= 105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30=690
99.30×50= 1500
100.5×700=3500
1.做錯3題,對17題
2、10+1.8(X-3)=13.6 解得x=5. 答案5千米
3.18個棋子
設甲有X個棋子,乙就有2x個。
x+9=2x-9
4.電線桿的問題你沒有說清,我無法解答。可以直接在線交談
5、小名做對15題。
1.45+15×6= 135
2.250÷5×8= 400
3.6×5÷2×4= 60
4.30×3+8= 98
5.400÷4+20×5= 200
6.10+12÷3+20= 34
7.(80÷20+80)÷4= 21
8.70+(100-10×5)=120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45= 115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9= 60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70= 230
21.18-64÷8= 10
22.42÷6+20= 27
23.40-5×7= 5
24.80+60÷3= 100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80= 70
29.25×16= 400
30.120×25= 300
31.36×11= 396
32.1025÷25= 41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010= 2010
37.12×50=600
38.25×8= 200
39.23×11= 253
40.125÷25= 5
41.4200-2200= 2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200= 0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40= 70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 = 4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 = 5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 = 40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 = 40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 = 6
64.96÷16 = 6
65.78÷26 = 3
66.51÷17 = 3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 = 25
70.240÷40 = 6
71.920÷4 =230
72.300÷60= 5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 =10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 = 15
79.400+80 = 480
80.400-80 =320
81.40×80 = 3200
82.400÷80 =5
83.48÷16 = 3
84.96÷24 = 4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10=360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 104
94.7×15= 105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30=690
99.30×50= 1500
100.5×700=3500
選我做最佳答案是個好的選擇哦!不選不勉強
數學題求解!!急急急急急急急急!~
糧食庫占地呈圓域狀,斜對面有一公路,從儲備庫中心A向東1km是儲備庫邊界上的點B,向東再走2km到達公路上點C;從A向北走2.8km到達公路上另一點D,在儲備庫邊界上選點E,修建由E往公路CD專用路EF,要求EF最短,問點E選在何處?不知道你現在是什么知識水平,不過本人看來這道題目最簡單的做法還是建立平面直角坐標系。A作為原點,A,B,C都在X軸上,A,D作為Y軸,設A為一個半徑為1KM的圓的圓心,然后設E點坐標為(x,y),E點在圓上,F點在直線CD上,很明顯EF得垂直于CD,然后求EF的最小值就好了。
解法2:幾何法。
作圓的切線,平行于CD那條的切點作為E點,然后引垂線到CD,垂足為F,就搞定了。
以A為原點建坐標系.可知圓半徑為1,工路方程y=1.4x 2.8,再用參數方程解得最短約為0.63.
您暫時還沒有收到系統消息
各位數學大俠們,幫忙解答一道數學題,要快啊!!很急的!!拜托 謝謝啦~~~
等腰直角三角形AOC和等腰直角三角形BOD,∠CAO=∠DBO=90°C,O,D在同一條直線上,M為CD的中點,判斷MA與MB的關系。=
從A.B兩點分別向CD做垂線交與P.Q點
PQ=1/2CD=PM+QM
CM=1/2CD=CP+PM
所以CP=QM
AP=QM
同理PM=BQ
<APM=90=<BPM
所以三角形APM全等于三角形MQB
所以AM=BM
數學問題,各位大俠幫幫忙,非常急呀!!!
一個密碼箱,密碼共七位數。由于主人忘記密碼,至今尚未打開,不過主人知道這個七位數在800萬與900萬之間;并且知道十萬位上是4,百位上的數比百萬位上的數小5,其余四位是0,0,0,1;其中,讀數時,讀出兩個零。你知道這個密碼嗎?8400301
我的同學,數學高手算出來了8400301
8400301
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