Question

5(x+3)-2(x+5) упростите и найдите значение​

Answer 1

Ответ:

3(2x - y) + 2(x + 4y) - 5(2x - 3y) =

= 6x - 3y + 2x + 8y - 10x + 15y = -2x + 20 y

при x = 3, y = -1

-2 * 3 + 20*(-1) = -6 -20 = -26