已知x+y=5 xy=3 求(x-y)^2
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已知x+y=5xy=3求(x-y)^2已知x+y=5xy=3求(x-y)^2已知x+y=5xy=3求(x-y)^2(x-y)²=(x+y)²-4xy=5²-4*3=25-
已知x+y=5 xy=3 求(x-y)^2
已知x+y=5 xy=3 求(x-y)^2
已知x+y=5 xy=3 求(x-y)^2
(x-y)²=(x+y)²-4xy=5²-4*3=25-12=13
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