已知x^2-xy=8,xy-y^2=3,分别求下列各式的值.(1)X^2-y^2(2)x^2-2xy+y^2

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已知x^2-xy=8,xy-y^2=3,分别求下列各式的值.(1)X^2-y^2(2)x^2-2xy+y^2已知x^2-xy=8,xy-y^2=3,分别求下列各式的值.(1)X^2-y^2(2)x^2

已知x^2-xy=8,xy-y^2=3,分别求下列各式的值.(1)X^2-y^2(2)x^2-2xy+y^2
已知x^2-xy=8,xy-y^2=3,分别求下列各式的值.
(1)X^2-y^2
(2)x^2-2xy+y^2

已知x^2-xy=8,xy-y^2=3,分别求下列各式的值.(1)X^2-y^2(2)x^2-2xy+y^2
（1）x²-y²=(x²-xy)+(xy-y²)
=8+3
=11
(2) x²-2xy+y²=x²-xy-xy+y²
=(x²-xy)-(xy-y²)
=8-3
=5

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