Đáp án:
Giải thích các bước giải:
a) $x^3-2x^2+x\\=x(x^2-2x+1)\\=x(x-1)^2$
b) $x^2-2x-15\\=x^2+3x-5x-15\\=x(x+3)-5(x+3)\\=(x+3)(x-5)$
c) $5x^2y^3-25x^3y^4+10x^3y^3\\=5x^2y^3(-5xy+2xx+1)$
d) $12x^2y-18xy^2-30y^2\\=6y(2x^2-3xy-5y)$
e) $5(x-y)-y(x-y)\\=(x-y)(5-y)$
f) $y(x-z)+7(z-x)\\=y(x-z)-7(x-z)\\=(x-z)(y-7)$