x^2+y^2=9,xy=-4求(x+y)^2和(x-y)^2

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x^2+y^2=9,xy=-4求(x+y)^2和(x-y)^2x^2+y^2=9,xy=-4求(x+y)^2和(x-y)^2x^2+y^2=9,xy=-4求(x+y)^2和(x-y)^2(x+y)&s

x^2+y^2=9,xy=-4求(x+y)^2和(x-y)^2
x^2+y^2=9,xy=-4求(x+y)^2和(x-y)^2

x^2+y^2=9,xy=-4求(x+y)^2和(x-y)^2
(x+y)²=x²+2xy+y²=9-8=1,(x-y)²=x²-2xy+y²=9+8=17

(x+y)^2=x²+y²+2xy=9-2×4=1
(x-y)^2=x²+y²-2xy=9+2×4=17

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