
已知1/a+1/b=1/a+b,则b/a+a/b等于
3个回答
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1/a+1/b=1/a+b
(a+b)/ab=1/(a+b)
∴(a+b)²=ab
b/a+a/b
=(a²+b²)/ab
=[(a+b)²-2ab]/ab
=(ab-2ab)/ab
=-1
(a+b)/ab=1/(a+b)
∴(a+b)²=ab
b/a+a/b
=(a²+b²)/ab
=[(a+b)²-2ab]/ab
=(ab-2ab)/ab
=-1
展开全部
1/a+1/b=1/(a+b)
(a+b)/(ab)=1/(a+b)
(a+b)^2/(ab)=1
(a^2+2ab+b^2)/(ab)=1
(a^2+b^2)/ab+2ab/(ab)=1
(a^2+b^2)/ab+2=1
(a^2+b^2)/(ab)=-1
a^2/(ab)+b^2/(ab)=-1
a/b+b/a=-1
(a+b)/(ab)=1/(a+b)
(a+b)^2/(ab)=1
(a^2+2ab+b^2)/(ab)=1
(a^2+b^2)/ab+2ab/(ab)=1
(a^2+b^2)/ab+2=1
(a^2+b^2)/(ab)=-1
a^2/(ab)+b^2/(ab)=-1
a/b+b/a=-1
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展开全部
1/a+1/b=1/(a+b)
(a+b)/ab=1/(a+b)
(a+b)²=ab
b/a+a/b
=(b²+a²)/ab
=[(a+b)²-2ab]/ab
=(ab-2ab)/ab
=-1
(a+b)/ab=1/(a+b)
(a+b)²=ab
b/a+a/b
=(b²+a²)/ab
=[(a+b)²-2ab]/ab
=(ab-2ab)/ab
=-1
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评论
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