已知 a分之1减去b分之1=3 求分式2a+ab-2b分之a-2ab-b的值.
人气：308 ℃ 时间：2020-04-02 16:20:03
解答
∵ 1/a-1/b=3
∴a-b=-3ab
原式=[2（a-b）+3ab]/[（a-b）-ab]
=-3ab/-4ab
=3/4
楼上做反了啊.
推荐
猜你喜欢
- happiness is for everyone.求译!
- 写小数时,整数部分仍按( )的写法,整数部分是0的要写( ).
- 《人民解放军百万大军横渡长江》一文是按什么顺序报道三路军的渡江作战的?为什么这样安排顺序?
- 屏风,纳凉,帷幕,缓冲,造型,伧俗、雅俗之别造句
- To turn your dream into reality,you should first ______the hard life here which you has not got used to so far
- 足球循环赛中,红队胜黄队,比分为4:1,黄队胜蓝队,比分为1:0,蓝队胜红队,比分为1:0,算各队的净胜球数.
- 2.2*(-2.1)+1.21*4.2-2.1*0.22简算!
- it took him three hours to clean his bedroom的同义句
