根号x-y+x^2-4x+4=0,求根号xy

根号x-y+x^2-4x+4=0,求根号xy
根号x-y+x^2-4x+4=0,求根号xy

根号x-y+x^2-4x+4=0,求根号xy
根号x-y+x^2-4x+4=0,
√（x-y）+(x-2)²=0;
∴x-y=0;
x-2=0;
∴x=2;
y=x=2;
∴根号xy
=√(2×2)
=2;
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