Question

Tính nhanh:

a, \(A=\frac{1.2.3+2.4.6+3.6.9+4.8.12}{3.4.5+6.8.10+9.12.15+12.16.20}\)

b, \(B=10101.\left(\frac{5}{111111}+\frac{2}{333333}+\frac{19}{3.7.11.13.37}\right)\)

Answer 1

A = 1.2.3+2³.1.2.3+3³.1.2.3+4³.1.2.3 /3.4.5+2³.3.4.5+3³.3.4.5+4³.3.4.5

   =1.2.3 (1+2³+3³+4³)/3.4.5 (1+2³+3³+4³)

   =1.2.3/3.4.5

   =1/10

B=10101 ( 15/333333 + 2/333333 +57 / 333333 )

B=10101 . 74 /333333

  =74/33

Answer 2

bai....................kho......................wa.....................troi.........................thi.................lanh...............lai....................mua...................tich....................ung.....................ho..................minh....................nha.......................huhu

Answer 3

kh quá