Question

Решите и распишите:2a-(a-(a-(2a-b))

Answer 1

2а - ( а - ( а - ( 2а - b )) ) = 2a - ( a - ( a - 2a + b )) = 2a - ( a - ( - a + b )) = 2a - ( a + a - b ) = 2a - ( 2a - b ) = 2a - 2a + b = b