计算 (x²/x+y)-x-y
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/10 05:51:41
计算 (x²/x+y)-x-y
计算 (x²/x+y)-x-y
计算 (x²/x+y)-x-y
是不是x²/(x+y)-x-y?
x²/(x+y)-x-y=x²/(x+y)-(x+y)²/(x+y)=[x²-(x+y)²]/(x+y)=-(2xy+y²)/(x+y)
=-y(2x+y)/(x+y)
=(x+y)-x-y
=x+y-x-y
=0
收录互联网各类作业题目,免费共享学生作业习题
作文号手机作业共收录了 千万级 学生作业题目
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/10 05:51:41
计算 (x²/x+y)-x-y
计算 (x²/x+y)-x-y
计算 (x²/x+y)-x-y
是不是x²/(x+y)-x-y?
x²/(x+y)-x-y=x²/(x+y)-(x+y)²/(x+y)=[x²-(x+y)²]/(x+y)=-(2xy+y²)/(x+y)
=-y(2x+y)/(x+y)
=(x+y)-x-y
=x+y-x-y
=0