a b=7,a^2 b^2=29,求(a-b)^2的值

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ab=7,a^2b^2=29,求(a-b)^2的值ab=7,a^2b^2=29,求(a-b)^2的值ab=7,a^2b^2=29,求(a-b)^2的值a^2+b^2=29,ab=7(a-b)^2+2a

a b=7,a^2 b^2=29,求(a-b)^2的值
a b=7,a^2 b^2=29,求(a-b)^2的值

a b=7,a^2 b^2=29,求(a-b)^2的值
a^2+ b^2=29,ab=7
(a -b)^2+2ab=29
(a -b)^2=15
a -b=√15,a -b=-√15)(舍去)
a -b=√15

(a-b)^2
=a^2+b^2-2ab
=29-14
=15