Toán Lớp 8: 4x (x + 3) + (1

4x(x+3)+(1-2x)(2x+1)=7 <=>4x^2+12x+2x+1-4x^2-2x=7 <=>(4x^2-4x^2)+(2x-2x)+12x+1 <=>12x+1=7 <=>12x=6 <=>x=1/2 vậy S={1/2}

4x(x+3)+(1-2x)(1+2x)=7 <=>4x^2+12x+1-4x^2=7 <=>(4x^2-4x^2)+12x+1=7 <=>12x=7-1 <=>12x=6 <=>x=1/2 Vậy S={1/2}

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Toán Lớp 8: 4x (x + 3) + (1 – 2x) (2x +1) = 7