Giải:
a) \(3x-3y-x^2+2xy-y^2\)
\(=3x-3y-\left(x^2-2xy+y^2\right)\)
\(=3\left(x-y\right)-\left(x-y\right)^2\)
\(=\left(x-y\right)\left(3-\left(x-y\right)\right)\)
\(=\left(x-y\right)\left(3-x+y\right)\)
Vậy ...
b) \(6x^3-30x^2y-36xy^2\) (Sửa đề)
\(=6x\left(x^2-5xy-6y^2\right)\)
\(=6x\left(x^2+xy-6xy-6y^2\right)\)
\(=6x\left[x\left(x+y\right)-6y\left(x+y\right)\right]\)
\(=6x\left(x+y\right)\left(x-6y\right)\)
Vậy ...
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