Question

Tim x , biet

c) x - \(\frac{5}{7}=\frac{2}{7}.\frac{11}{5}\)

d) \(\frac{2x}{5}=\frac{6}{2x-1}\)

Answer 1

Biến x đâu bạn ?

Answer 2

-1/5

nha

Answer 3

>: kệ đề bài nhá, bài cho j lm cái đó.

a, \(\frac{-5}{7}+\frac{3}{4}+\frac{-1}{5}+\frac{-2}{7}+\frac{1}{4}\)

\(\frac{-5}{7}+\frac{3}{4}-\frac{1}{5}-\frac{2}{7}+\frac{1}{4}=-1+1-\frac{1}{5}=-\frac{1}{5}\)

b, \(\frac{-3}{31}+\frac{-6}{17}+\frac{1}{25}+\frac{-28}{31}+\frac{-11}{17}+\frac{-1}{5}\)

\(=\frac{-3}{31}-\frac{6}{17}+\frac{1}{25}-\frac{28}{31}-\frac{11}{17}-\frac{1}{5}=-1-1-\frac{4}{25}==-2-\frac{4}{25}=-\frac{54}{25}\)

Sai j sửa hộ.

Answer 4

minh sua lai de roi nha bn