Question

bài 1: thực hiện phép tính

A) 5/6 : -7/12

B) -21/24 : -14/8

c) 4/5 : -8/15

d) -15/16 . 8/-25

đ) 2/3 - 5/7 . 14/25

e)28/15.0,75 - ( 8/15 + 25%)

f) 0,75 - 43/80 : ( -4/5 + 2,5 . 3/4)

i) -5/8 . 5/12 + -5/8 . 7/12 + 17/8

0) 25% - 3/2 + 0,5 . 12/5

p) (-3,2) . -15/64+)0,8 - 34/15): 7/2

l) 75% - 3/2 + 0,5 : 5/12 - ( -1/2)mũ 2

giup mình với

mai nộp rồi

Answer 1

a: \(=\dfrac{5}{6}\cdot\dfrac{-12}{7}=\dfrac{-10}{7}\)

b: \(=\dfrac{7}{8}\cdot\dfrac{8}{14}=\dfrac{7}{14}=\dfrac{1}{2}\)

c: \(=\dfrac{4}{5}\cdot\dfrac{-15}{8}=\dfrac{-3}{2}\)

d: \(=\dfrac{15}{16}\cdot\dfrac{8}{25}=\dfrac{15}{25}\cdot\dfrac{1}{2}=\dfrac{3}{5}\cdot\dfrac{1}{2}=\dfrac{3}{10}\)

đ: \(=\dfrac{2}{3}-\dfrac{70}{175}=\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{10-6}{15}=\dfrac{4}{15}\)