比较这两者大小要过程.X(X-Y)与Y(X-Y)(X≠Y)

问题描述:

比较这两者大小要过程.X(X-Y)与Y(X-Y)(X≠Y)

X(X-Y)-Y(X-Y)=x^2-2xy+y^2=(x-y)^2>0,因(X≠Y),所以X(X-Y)大于Y(X-Y)