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