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HỒ ĐỨC KHOA
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2022-03-01 08:17:20
P = 1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4+ 1/4 - 1/5 + ............. + 1/99 - 1/100
= 1/1 - 1/100
= 99/100
2022-02-26 18:55:10
TL
Phân tích :
= ( a x 1000 + a x 100 + a x 10 + a x 1 ) + ( a x 100 + a x 10 + a x 1 ) + ( a x 10 + a x 1 ) + a x 1 = 2468
= a x 1111 + a x 111 + a x 11 + a x 1 = 2468
= a x ( 1111 + 111 + 11 + 1 ) = 2468
= a x 1234 = 2468
Suy ra : a x 1234 = 2468
a = 2468 : 1234
a = 2
2022-02-25 19:27:43
2022-02-25 19:26:25
TL
Phân tích :
= ( a x 1000 + a x 100 + a x 10 + a x 1 ) + ( a x 100 + a x 10 + a x 1 ) + ( a x 10 + a x 1 ) + a x 1 = 6170
= a x 1111 + a x 111 + a x 11 + a x 1 = 6170
= a x ( 1111 + 111 + 11 + 1 ) = 6170
= a x 1234 = 6170
Suy ra : a x 1234 = 6170
a = 6170 : 1234
a = 5
2022-02-25 19:18:00
2022-02-25 19:15:30
2022-02-25 19:14:58
2022-02-25 19:10:11
2022-02-25 19:09:46
2022-02-25 19:07:07