Question

1. 7(b-2)+(2-b). 2. 3(x-7)-y(7-x). 3.c(x-5)+(5-x). 4. x-p+(p-x)c.
Помогите решить 40. Баллов

Answer 1

1) 7b -14 +2 - b = 6b -12 = 6 (b - 2)
2) 3x - 21 - 7y + xy = 3x +xy - 7y - 21
3) cx -5c +5 - x  
4) x-p+pc-xc