Question

2x(x+y)-3y(x+y)+7(x+y) при x=4, y=5

Answer 1

(x+y)(2x-3y+7)=
(4+5)(2*4-3*5+7)=
(9)(8-15+7)=
9*0=
0
Ответ: 0.

Answer 2

2*4*(4+5)-3*5*(4+5)+7*(4+5)=28008