2a+3b-3a-5b+3,a=-1b=2

问题描述:

2a+3b-3a-5b+3,a=-1b=2

2a + 3b - 3a - 5b + 3
= -a - 2b + 3
= -(-1) - 2 ×2 + 3
= 1 - 4 + 3
= 0