\(a,3x\left(5x^2-2x-1\right)=15x^3-6x^2-3x\)
\(b,\left(x^2-2xy+3\right)\left(-xy\right)=-x^3y+2x^2y^2-3xy\)
\(c,\dfrac{1}{2}x^2y\left(2x^3-\dfrac{2}{5}xy^2-1\right)=x^5y-\dfrac{2}{25}x^3y^3-\dfrac{1}{2}x^2y\)
\(d,\dfrac{2}{7}x\left(1,4x-3,5y\right)=\dfrac{2}{5}x^2-xy\)
\(e,\dfrac{1}{2}xy\left(\dfrac{2}{3}x^2-\dfrac{3}{4}x+\dfrac{4}{5}y^2\right)=\dfrac{3}{4}x^3y-\dfrac{3}{8}x^2y+\dfrac{2}{5}xy^3\)
\(f,\left(1+2x-x^2\right)5x=5x+10x^2-5x^3\)
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