\(a,=5\left(x^2-y^2\right)-10\left(x-y\right)=5\left(x-y\right)\left(x+y\right)-10\left(x-y\right)=\left(x-y\right)\left[5\left(x+y\right)-10\right]\\----------\\ b,=x^2\left(x+y\right)-4\left(x+y\right)=\left(x^2-4\right)\left(x+y\right)=\left(x-2\right)\left(x+2\right)\left(x+y\right)\\ ----------\\ c,=x^2\left(x-1\right)-\left(x-1\right)=\left(x^2-1\right)\left(x-1\right)=\left(x-1\right)^2\left(x+1\right)\\ ----------\\ d,Sửa:x^3-3x^2+3x-1-y^3=\left(x-1\right)^3-y^3=\left[\left(x-1\right)-y\right]\left[\left(x-1\right)^2+\left(x-1\right).y+y^2\right]\)
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