Question

Tìm x biết

a) - ( 1/2 x X - 3/4 ) - (- x + 1 ) = - 3/2

b) - 5 x (2 x X - 2/5 ) +1/3 x ( - X + 1 ) = -3/2

                                                   CẢM ƠN NHA!

Answer 1

\(-\left(\frac{1}{2}.x-\frac{3}{4}\right)-\left(-x+1\right)=-\frac{3}{2}\) \(\frac{3}{2}\)

<=> \(-\frac{1}{2}x+\frac{3}{4}+x-1=\frac{-3}{2}\)

<=> \(\frac{1}{2}x-\frac{1}{4}=\frac{-3}{2}\)

<=> \(\frac{1}{2}x=-\frac{5}{4}\)

<=> \(x=\frac{-5}{2}\)

\(-5.\left(2x-\frac{2}{5}\right)+\frac{1}{3}x.\left(-x+1\right)\) \(=-\frac{3}{2}\)

<=> \(-10x+2-\frac{x^2}{3}+\frac{1}{3}x\) \(=\frac{-3}{2}\)

làm nốt nha

mk phải đi học rồi

Answer 2

cảm ơn bạn