Question

5/7x-x=8/7

Answer 1

\(\dfrac{5}{7}x-x=\dfrac{8}{7}\)

Bài làm

Ta có:

\(\Rightarrow\dfrac{5}{7}x-x.1=\dfrac{8}{7}\)

\(\Rightarrow(\dfrac{5}{7}-1).x=\dfrac{8}{7}\)

\(\Rightarrow-\dfrac{2}{7}.x=\dfrac{8}{7}\)

\(\Rightarrow x=\dfrac{8}{7}:-\dfrac{2}{7}\)

\(\Rightarrow x=\dfrac{8}{7}.-\dfrac{7}{2}\)

\(\Rightarrow x=-\dfrac{56}{14}=-4\)

\(Vậy\) x = -4

Answer 2

\(\dfrac{5}{7}x-x=\dfrac{8}{7}\)

\(\dfrac{5}{7}x-1.x=\dfrac{8}{7}\)

\(\Rightarrow x\left(\dfrac{5}{7}+1\right)=\dfrac{8}{7}\)

\(\Rightarrow x\left(\dfrac{12}{7}\right)=\dfrac{8}{7}\)

\(x=\dfrac{8}{7}\div\dfrac{12}{7}=\dfrac{8}{7}.\dfrac{7}{12}\)

\(x=\dfrac{2}{3}\)

bn tự vậy nhé !!!

~ chúc bn học tốt ~