Question

2а-b. a-2b+c
——- - ———-
a+b-c a+b-c

Answer 1

Ответ:

$\frac{2a - b}{a + b - c} - \frac{a - 2b + c}{a + b - c} = \frac{2a - b - (a - 2b + c)}{a + b - c} = \frac{2a - b - a + 2b - c}{a + b - c} = \frac{a + b - c}{a + b - c} = 1$