2a/a²-9-1/a-3计算
问题描述:
2a/a²-9-1/a-3计算
答
2a/a²-9-1/a-3
=[2a-(a+3)]/(a+3)(a-2)
=(a-3)/(a+3)(a-3)
=1/(a+3)
如追加其它问题,