x2+y2=12,xy=4,x-y=多少
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x2+y2=12,xy=4,x-y=多少x2+y2=12,xy=4,x-y=多少x2+y2=12,xy=4,x-y=多少x2+y2=12,xy=4,x-y=?(x-y)2=x2+y2-2xy=14-4
x2+y2=12,xy=4,x-y=多少
x2+y2=12,xy=4,x-y=多少
x2+y2=12,xy=4,x-y=多少
x2+y2=12,xy=4,x-y=?
(x-y)2=x2+y2-2xy=14-4=10
x-y=正负根号10
14
若x-y/x+y=2,则x2+2xy+y2/4xy=多少
x2+y2=12,xy=4,x-y=多少
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