Bal 7:Tim x : D 5x^2-10x=0 2) 8x^2+10x=0 3) 12x-3x^2=0 4) 21x-7x^2=0 x^2-15x=0 6 x^2(2x+15)+4(2x+15)=0 7) 3x(x-10)-x+10=0 8 2(x+3)-x^2-3x=0 9) 3x(x-2)-x+2=0 10 x^2(x+1)+2x(x+1)=0 II) x(x-2)-2(3-2x)=0 12) x(2x-3)-2(3-2x)=0 13) 5(x+3)=2x(3+x) Bài 8. C himg mich: (x-2)(x^2+2x+5)+2(x-2)(x+2)=5(x-2)=0

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