计算 (x²/x+y)-x-y
来源:学生作业帮助网 编辑:六六作业网 时间:2025/01/22 21:45:06
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=x
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