Question

x(3x-2y)(3x+2y)-x(3x+2y)^2+2xy(5x+2y) при x=0,5 y=-1

Answer 1

=х(9х^2+6ху-6ху-4у^2)-х(9х^2+12ху+4у*2)+2ху(5х+2у)=9х^3-4у^2х-9х^3-12х^2у-4у^2х+10х^2у+4ху^2=-4у^2х-2х^2у=-4(1)^2*0,5-2(0,5)^2*1=-2-0,5=-2,5