已知:x+y=-3,xy=-0.5,求:(1)x2+y2;(2)(x-y)2
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已知:x+y=-3,xy=-0.5,求:(1)x2+y2;(2)(x-y)2已知:x+y=-3,xy=-0.5,求:(1)x2+y2;(2)(x-y)2已知:x+y=-3,xy=-0.5,求:(1)x
已知:x+y=-3,xy=-0.5,求:(1)x2+y2;(2)(x-y)2
已知:x+y=-3,xy=-0.5,求:(1)x2+y2;(2)(x-y)2
已知:x+y=-3,xy=-0.5,求:(1)x2+y2;(2)(x-y)2
(1) x+y=-3 ( x+y)^2=9 x^2+2xy+y^2=9 x^2+y^2=9+1=10 (2)(x-y)^2=x^2-2xy+y^2=10+1=11
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