X-Y=4,xy=12则xx+YY的值
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X-Y=4,xy=12则xx+YY的值
X-Y=4,xy=12则xx+YY的值
X-Y=4,xy=12则xx+YY的值
xx+yy=x²+y²-2xy+4xy=(x-y)²+2xy=4*4+2*12=40
已知2x=3y,求xy/xx+yy-yy/xx-yy的值
X-Y=4,xy=12则xx+YY的值
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