\(a,=\left(x-y\right)\left(x+y\right)+3\left(x-y\right)=\left(x+y+3\right)\left(x-y\right)\\ b,=\left(x+y\right)^2-1=\left(x+y+1\right)\left(x+y-1\right)\\ c,=6x\left(x^2+2\right)+2\left(x^2+2\right)=2\left(x+3\right)\left(x^2+2\right)\\ d,=5x\left(1-2y\right)+6\left(2y-1\right)=\left(5x-6\right)\left(1-2y\right)\)
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a) x2-y2+3x-3y
=(x-y)(x+y)+3(x-y)
= (x-y)(x+y+3)
tick cho mk nha
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