Question

Answer 1

câu 9 làm dưới rồi

10

\(\dfrac{3}{4}+\left(x-0,75\right)=-2,5\\ \dfrac{3}{4}+\left(x-\dfrac{3}{4}\right)=-\dfrac{5}{2}\\ x-\dfrac{3}{4}=-\dfrac{5}{2}-\dfrac{3}{4}\\ x-\dfrac{3}{4}=-\dfrac{13}{4}\\ x=-\dfrac{13}{4}+\dfrac{3}{4}\\ x=\dfrac{-10}{4}=\dfrac{-5}{2}\)