His third grade teacher wrote, “His mother’s death has been hard on him. He tries to do his best but his father doesn’t show much interest and his home life will soon affect him _______ .”
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举一反三
【简答题】已知函数 φ(x)= a x+1 ,a为正常数. (Ⅰ)若f(x)=lnx+φ(x),且 a= 9 2 ,求函数f(x)的单调减区间; (Ⅱ)若g(x)=|lnx|+φ(x),且对任意x 1 ,x 2 ∈(0,2],x 1 ≠x 2 ,都有 g( x 2 )-g( x 1 ) x 2 - x 1 <-1 ,求a的取值范围.