Question

若x,y满足等式|x+2|+(y-3)^2=0,则(5x^2 y+5xy-7x)-(4x^2y+5xy-7x)的值为?

Answer 1

x+2=0

y-3=0

x=-2

y=3

(5x^2 y+5xy-7x)-(4x^2y+5xy-7x)

=5x^2 y+5xy-7x-4x^2y-5xy+7x

=x^2y

=4*3

=12