Question

-2(x-1/2)-5(3/10-1)=7

Lúc nãy mk viết sai. M.n giúp mk nha.Mk đang cần gấp

Answer 1

\(-2\left(x-\frac{1}{2}\right)-5\left(\frac{3}{10}-1\right)=7\)

\(-2\left(x-\frac{1}{2}\right)-5.\frac{-7}{10}=7\)

\(-2\left(x-\frac{1}{2}\right)-\frac{-7}{2}=7\)

\(-2\left(x-\frac{1}{2}\right)=7+\frac{-7}{2}\)

\(-2\left(x+\frac{1}{2}\right)=\frac{7}{2}\)

\(x+\frac{1}{2}=\frac{7}{2}:-2\)

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

\(x=\frac{-7}{4}-\frac{1}{2}\)

\(x=-\frac{9}{4}\)

Answer 2

\(-2\left(x-\frac{1}{2}\right)-5\left(\frac{3}{10}-1\right)=7\)

\(-2x+1-15+5-7=0\)

\(-2x-16=0\)

\(-2\left(x+8\right)=0\)

\(=>x+8=0\)

\(=>x=-8\)