Question

[Nguyễn Thị Thu Trang]

1. tính :

A = 7/11 . -39/190 . 76/21

B = (5/8 + 4/5 ).( 2-2/107 )

Answer 1

[Nguyễn Thị Thu Trang]

ai giúp t vs

Answer 2

[Trần Thị Thu Hường]

\(A=\frac{7}{11}\cdot\frac{-39}{190}\cdot\frac{76}{21}=\frac{-39\cdot7\cdot76}{11\cdot190\cdot21}=\frac{-273}{550}\)

B=\(\left(\frac{5}{8}+\frac{4}{5}\right)\)\(\cdot\left(2-\frac{2}{107}\right)\)

=>B=\(\frac{57}{40}\cdot\frac{212}{107}=\frac{57\cdot212}{40\cdot107}=\frac{3021}{1070}\)