先化简1-a-1/a÷a²-1/a²+2a,在选取一个合适的值代入计算
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 02:50:59
![先化简1-a-1/a÷a²-1/a²+2a,在选取一个合适的值代入计算](/uploads/image/z/1050380-44-0.jpg?t=%E5%85%88%E5%8C%96%E7%AE%801-a-1%2Fa%C3%B7a%26%23178%3B-1%2Fa%26%23178%3B%2B2a%2C%E5%9C%A8%E9%80%89%E5%8F%96%E4%B8%80%E4%B8%AA%E5%90%88%E9%80%82%E7%9A%84%E5%80%BC%E4%BB%A3%E5%85%A5%E8%AE%A1%E7%AE%97)
先化简1-a-1/a÷a²-1/a²+2a,在选取一个合适的值代入计算
先化简1-a-1/a÷a²-1/a²+2a,在选取一个合适的值代入计算
先化简1-a-1/a÷a²-1/a²+2a,在选取一个合适的值代入计算
1-(a-1)/a×a(a+2)/(a+1)(a-1)
=1-(a+2)/(a+1)
=[(a+1)-(a+2)]/(a+1)
=-1/(a+2)
取a=0
∴原式=-1/(0+2)=-1/2