Question

rut gon bieu thuc

(-a-b+c) - (-a-b-c)-2b

Answer 1

= -a - b + c + a + b +c -2b

= 2c- 2b

=2. ( c - b)

hok tốt

Answer 2

\(\left(-a-b+c\right)-\left(-a-b-c\right)-2b\)

\(=-a-b+c+a+b+c-2b\)

\(=2c-2b=2.\left(c-b\right)\)