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) \(\dfrac{1}{2}x^2y\left(2x^3-\dfrac{2}{5}xy^2-1\right)\)
\(=x^5y-\dfrac{1}{5}x^3y^3-\dfrac{1}{2}x^2y\)
a) 3x(5x2-2x-1) = 15x3 - 6x2 - 3x
b) (x2+2xy-3)(-xy) = -x3y - 2x2y2 + 3xy
c) \(\dfrac{1}{2}\)x2y\((\)2x3 - \(\dfrac{2}{5}\)xy2 - 1) = x5y - \(\dfrac{1}{5}\)x3y3 - \(\dfrac{1}{2}\)x2y
a) 3x (5x2-2x-1)
=15x3-6x2-3x
b) (x2-2xy-3)(-xy)
=-x3y+2x2y2+3xy
c) 1/2x2y(2x3-2/5xy2-1)
=x5y-1/5x3y3-1/2x2y
a. 3x(5x2 - 2x -1) = 15x3 - 6x2 - 3x
b. (x2+2xy -3)(-xy) = - x3y – 2x2y2 + 3xy
c. \(\dfrac{1}{2}\)x2y ( 2x3- \(\dfrac{2}{5}\)xy2-1 )= x5y -\(\dfrac{1}{5}\)x3y3- \(\dfrac{1}{2}\)x2y