Question

Answer 1

a: \(3x^2\left(2x^3-x+5\right)=6x^5-3x^3+15x^2\)

b: \(x^2y\left(4xy+3y-5x\right)=4x^3y^2+3x^2y^2-5x^3y\)

c: \(-\dfrac{4}{3}xy\left(3x^2y-6xy+9x\right)=-4x^3y^2+8x^2y^2-12x^2y\)

Answer 2

d: Ta có: \(-\dfrac{1}{3}xz\left(-9xy+15yz\right)+3x^2\left(2yz^2-yz\right)\)

\(=3x^2yz-5xyz^2+6x^2yz^2-3x^2yz\)

\(=-5xyz^2+6x^2yz^2\)