计算 (x²/x+y)-x-y

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/30 06:34:49
计算 (x²/x+y)-x-y

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