bai4 tìm x bta)2x(x-3)-(3-x)=0b)3x(x+5)-6(x+5)=0c)x^4-x^2=0d)5x(x-2)-(2-x)=0e)4x(x+1)=8(x+1)f)x(x-4)+(x-4)^2=0g)x^2-5x=0h)3x(x-2)+2(2-x)=0i)5x(3x-1)+x(3x-1)-2(3x-1)=0
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