作业帮2/a-1 - a+2/a²+8a-9 / 3/2a+18
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/30 01:37:26
2/a-1 - a+2/a²+8a-9 / 3/2a+18
2/a-1 - a+2/a²+8a-9 / 3/2a+18
2/a-1 - a+2/a²+8a-9 / 3/2a+18
2/(a-1) -( a+2)/(a²+8a-9) / 3/2a+18
=2/(a-1) - (a+2)/(a+9)(a-1)×2（a+9）/3
=2/(a-1) - (a+2)/(a-1)×2/3
=(-2a+2)/(a-1)/3
=-2/3