Question

Tinh hop li 

a,87.36 + 87.64

b,91.51 + 49. 163 - 49.72

Answer 1

a,87.36 + 87.64 = 87 . (64 + 36) = 87 x 100 = 8700

b, 91.51 + 49.163 - 49.72 = 91.51 + ( 49.163 - 49.72 ) = 91.51 + 49.91 = 91.(51+49) = 91.100 = 9100

Answer 2

Tìm x

(5x+1)^2n=36/49

 (8x-1)^2n+1=5^2n+1