a、b为实数,且ab=1,设P=a/a+1 + b/b+1 ,Q=1/a+1 + 1/b+1 ,则P( )Q(填“>” “<” 或 “=” ).呵呵 记得回答啊
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![a、b为实数,且ab=1,设P=a/a+1 + b/b+1 ,Q=1/a+1 + 1/b+1 ,则P( )Q(填“>” “<” 或 “=” ).呵呵 记得回答啊](/uploads/image/z/10270718-62-8.jpg?t=a%E3%80%81b%E4%B8%BA%E5%AE%9E%E6%95%B0%2C%E4%B8%94ab%3D1%2C%E8%AE%BEP%3Da%2Fa%2B1+%2B+b%2Fb%2B1+%2CQ%3D1%2Fa%2B1+%2B+1%2Fb%2B1+%2C%E5%88%99P%28+%29Q%EF%BC%88%E5%A1%AB%E2%80%9C%EF%BC%9E%E2%80%9D+%E2%80%9C%EF%BC%9C%E2%80%9D+%E6%88%96+%E2%80%9C%3D%E2%80%9D+%EF%BC%89.%E5%91%B5%E5%91%B5+%E8%AE%B0%E5%BE%97%E5%9B%9E%E7%AD%94%E5%95%8A)
a、b为实数,且ab=1,设P=a/a+1 + b/b+1 ,Q=1/a+1 + 1/b+1 ,则P( )Q(填“>” “<” 或 “=” ).呵呵 记得回答啊
a、b为实数,且ab=1,设P=a/a+1 + b/b+1 ,Q=1/a+1 + 1/b+1 ,则P( )Q(填“>” “<” 或 “=” ).
呵呵 记得回答啊
a、b为实数,且ab=1,设P=a/a+1 + b/b+1 ,Q=1/a+1 + 1/b+1 ,则P( )Q(填“>” “<” 或 “=” ).呵呵 记得回答啊
ab=1,
P=a/(a+1 )+ b/(b+1)
把1=ab代入
= a/(a+ab)+ b/(b+ab)
分子分母约分
=1/(b+1)+ 1/(a+1)
所以P=Q.
ab=1,
P=a/(a+1 )+ b/(b+1)
= a/(a+ab)+ b/(b+ab)
=1/(b+1)+ 1/(a+1)
=Q.