化简:3x(5x^2-2)-x^2(4x+3)+8(7x+1)

问题描述:

化简:3x(5x^2-2)-x^2(4x+3)+8(7x+1)

3x(5x^2-2)-x^2(4x+3)+8(7x+1)
=15x³-6x-4x³-3x²+56x+8
=11x³-3x²+50x+8