Question

Answer 1

a: =>x-2+2=x^2+2x

=>x^2+2x=x

=>x^2+x=0

=>x(x+1)=0

=>x=0(loại) hoặc x=-1(nhận)

b: =>5(2x-1)+2x(2x+1)=4x^2-1-6+4x=4x^2+4x-7

=>4x^2+2x+10x-5-4x^2-4x+7=0

=>8x+2=0

=>x=-1/4

c: \(\Leftrightarrow\dfrac{x+5}{x\left(x-5\right)}-\dfrac{x-5}{2x\left(x+5\right)}=\dfrac{x+25}{2\left(x-5\right)\left(x+5\right)}\)

=>\(2\left(x+5\right)^2-\left(x-5\right)^2=x^2+25x\)

=>\(2x^2+20x+50-x^2+10x-25=x^2+25x\)

=>30x+25=25x

=>5x=-25

=>x=-5(loại)