x平方＋y平方
=x^2+y^2
=（x+y）^2-2xy
=4^2+24=40
x平方－xy＋y平方
=x^2-xy+y^2
=(x+y)^2-3xy
=4^2+36
=52
x+y=4,xy=－12,求x^+y^,x^-xy+y^
1个回答
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