Ответы и объяснения

2014-01-13T21:39:51+04:00
B(a+c)+2a+3c = b(a + c) + 2 (a + c) = (b + 2) (a + c)
c(a-b)+3a-3b = c (a - b) + 3 (a - b) = (c + 3) (a - b)
x-y+a(x-y) = (1 + a) (x - y)
y(b-x)+x-b = y (b - x) - 1 (b - x) = (y - 1) (b - x)