已知X²+Xy=8,y²+xy=2,求X²+2xy+y²和x²-y²的值
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已知X²+Xy=8,y²+xy=2,求X²+2xy+y²和x²-y²的值
已知X²+Xy=8,y²+xy=2,求X²+2xy+y²和x²-y²的值
已知X²+Xy=8,y²+xy=2,求X²+2xy+y²和x²-y²的值
x²+xy=8,y²+xy=2
两式相加得:x²+2xy+y²=10
两式相减得:x²-y²=6
x²+xy=8,y²+xy=2
x²=8-xy , y²=2-xy
x²-y²=8-xy-2+xy
x²-y²=6