bài 1 : a,5(3x+2)=4x+1 => 15x-4x -1+10=0 =>11x=-9 =>x=-9/11
b,(x+2)(2x+3)=0 =>x+2=0 hoặc 2x+3=0 => x=-2 hoặc x=-3/2
c,x-2+(5x-15)/2=0 =>2x-4+5x-15=0 =>7x-19=0 =>x=19/7
d,(x+2)/(x-2)-6/(x+2)=(x^2)(x^2-4) =>((x+2)^2)/((x-2)(x+2))-(6(x-2))/((x-2)(x+2))=(x^2)/((x-2)(x+2))
=>(x+2)^2-6(x-2)-x^2=0 =>x^2 +4x+4-6x+12-x^2=0 => -2x+16=0 => x=8