Question

Phân tích đa thức thành nhân tử:

\(a,3x-15xy\)

\(b,8x^2+6x-4\)

\(c,5x^2+25xy+10y^2\)

\(d,9x^2y^2+6x^2y-\dfrac{1}{2}xy^2\)

Answer 1

\(a,3x-15xy=3x\left(1-5y\right)\\ ---\\ 8x^2+6x-4=2\left(4x^2+3x-2\right)\\ ---\\ 5x^2+25xy+10y^2=5\left(x^2+5xy+2y^2\right)\\ ---\\ 9x^2y^2+6x^2y-\dfrac{1}{2}xy^2=\dfrac{1}{2}xy\left(18xy+12x-y\right)\)