Question

1.tìm x biết 

a)\(\frac{2}{3}\)x +\(\frac{5}{7}\)=\(\frac{3}{10}\)

b)\(\frac{1}{3}\)+\(\frac{-1}{2}\):x=-4

c)(x-\(\frac{2}{3}\)).(-\(\frac{1}{5}\)x+\(\frac{3}{5}\))=0

d)/3x-5/=4

 

Answer 1

\(\frac{2}{3}x+\frac{5}{7}=\frac{3}{10}\)

\(\Rightarrow\frac{2}{3}x=\frac{3}{10}-\frac{5}{7}\)

\(\Rightarrow\frac{2}{3}x=-\frac{29}{70}\)

\(\Rightarrow x=-\frac{29}{70}:\frac{2}{3}\)

\(\Rightarrow x=-\frac{87}{140}\)

tíc mình nha

Answer 2

còn câu b,c,d nữa mà

Answer 3

1/3+(-1)/2:x=-4

(-1)/2:x=-4-1/3

(-1/2):x=(-13)/3

x=3/26

Answer 4

còn câu cd