Question

Kết hợp: nếu dc

A) 2/3 + 1/5 .19/7

B) 2/7 + 5/7 . 14/25

C) 7/12-27/7.1/18

D) 3/10.(-5/6) - 1/8

E) (-4/9) . 3/8 + 1/18

F) 2/7 + 28/27 : (- 4/9)

G):(1/2 - 2/3).4/5

H) 9/7.(3/7 - 1/2 )

Giúp mình với

Thank you

Answer 1

a: \(=\dfrac{2}{3}+\dfrac{19}{35}=\dfrac{70+57}{105}=\dfrac{127}{105}\)

b: \(=\dfrac{2}{7}+\dfrac{2}{5}=\dfrac{24}{35}\)

c: \(=\dfrac{7}{12}-\dfrac{14}{2}=\dfrac{7-84}{12}=\dfrac{-77}{12}\)

d: \(=\dfrac{-15}{60}-\dfrac{1}{8}=-\dfrac{3}{8}\)

e: \(=-\dfrac{12}{72}+\dfrac{1}{18}=\dfrac{-3}{18}+\dfrac{1}{18}=\dfrac{-2}{18}=\dfrac{-1}{9}\)