Question

1. Tính hợp lí

a, 6/7 . 5/11 + 5/7 . 2/11 - 5/7 . 14/ 11

b, 1/3 . 4/5 + 1/3 . 6/5 - 1/3

( Hỗn số )

c, 11/3/13 - (2/4/7 + 5/3/13)

d, 2/7 . 5/1/4 - 2/7 . 3/1/4

e, 75 . (-4/24 + 7/1/15 - 5/7/15)

Giải hộ mình với ạ!

Answer 1

1. Tính hợp lí :

a) \(\frac{6}{7}.\frac{5}{11}+\frac{5}{7}.\frac{2}{11}-\frac{5}{7}.\frac{14}{11}\)

\(=\frac{5}{7}.\left(\frac{6}{11}+\frac{2}{11}-\frac{14}{11}\right)\)

\(=\frac{5}{7}.\frac{-6}{11}=-\frac{30}{77}\)

b) \(\frac{1}{3}.\frac{4}{5}+\frac{1}{3}.\frac{6}{5}-\frac{1}{3}\)

\(\frac{1}{3}.\left(\frac{4}{5}+\frac{6}{5}-\frac{1}{3}\right)\)

\(=\frac{1}{3}.\frac{5}{3}=\frac{5}{9}\)