Question

HELP HELP HELP HELP HELP HELP HELP

Answer 1

=2х^2-2ху-ху+2у^2-2х^2-2у^2=
=-3ху=-3×(-2.4)×5/3=2 2/5×5=
=12/5×5=12

Answer 2

2x(x-y)-y(x-2y)-2(x^2+y^2), если x= -2,4, y = 5/3
2x^2-2xy-xy+2y^2-2x^2-2y^2= -3xy = 7,2*5/3=72/10*5/3=12