a-1-a²/(a+1)
=[(a+1)(a-1)-a²]/(a+1)
=(a²-1-a²)/(a+1)
=-1/(a+1)
如果不懂,祝学习愉快!
猜你喜欢
- 1do the same thing 还是make the same thing
- 2地震如何影响天气
- 3毛细血管和小肠绒毛是怎样吸收的运输营养物质的?
- 4用…时而…时而造句(不超过30字)
- 5Do you have a lot of work to do today?这句话错在哪里,有个改错题
- 62012的三次方-2×2012的二次方/2012的三次方+2012的二次方-2013
- 7Are those your eraser?Yes they're()
- 8刘姥姥家的菜地里,种有茄子680平方米,种白菜的面积是种茄子面积的3/4,种南瓜的面积是种白菜面积的2/3
- 9七年级下册牛津版英语课本单词表
- 10I don‘t like these shoes.please show me