1.

9 - 5 b - [ 2 a - b - \{ 3 a - 2 c - a + 2 b \} ]

Answer»

9-5b-[2a-b-3a+2c+a-2b]=9-5b-[-3b+2c]=9-5b+3b-2c=9-2b-2c



Discussion

No Comment Found