Thực hiện phép tính:
a) \((x^2-2x+3)(\dfrac{1}{2}x-5)\)
b) \((x^2-2xy+y^2)(x-y)\)
a) \((x^2-2x+3)(\dfrac{1}{2}x-5)=\dfrac{1}{2}x^3-5x^2-x^2+10x+\dfrac{3}{2}x-15\)
\(=\dfrac{1}{2}x^3-6x^2+\dfrac{23}{2}x-15\)
b) \((x^2-2xy+y^2)(x-y)=x^3-x^2y-2x^2y +2xy^2+xy^2-y^3\)
\(x^3-3x^2y+3xy^2-y^3\)
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