计算 (x²/x+y)-x-y
来源:学生作业学帮网 编辑:学帮网 时间:2024/05/13 14:15:21
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
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来源:学生作业学帮网 编辑:学帮网 时间:2024/05/13 14:15:21
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