\(a,Sửa:2x^2+4x+2-2y^2\\ =x\left(x^2+2x+1-y^2\right)\\ =x\left[\left(x+1\right)^2-y^2\right]\\ =x\left(x+y+1\right)\left(x-y+1\right)\\ b,=x^2+2x+3x+6=\left(x+2\right)\left(x+3\right)\)
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