\(f,=\left(x-y\right)\left(x+y\right)-\left(x+y\right)=\left(x+y\right)\left(x-y-1\right)\\ g,=x^2-2xy=x\left(x-2y\right)\\ h,=\left(x-2\right)^2-y^2=\left(x-y-2\right)\left(x+y-2\right)\\ i,=\left(x^3-y^3\right)\left(x^3+y^3\right)\\ =\left(x-y\right)\left(x+y\right)\left(x^2+xy+y^2\right)\left(x^2-xy+y^2\right)\\ k,=\left(x+1\right)^3-27z^3=\left(x+1-3z\right)\left(x^2+2x+1+3xz+3z+9z^2\right)\\ l,=\left(2x+1\right)^2-9y^2=\left(2x+1-3y\right)\left(2x+1+3y\right)\\ m,=x\left(x-3\right)+y\left(x-3\right)=\left(x+y\right)\left(x-3\right)\)
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