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【简答题】
定义在（-1，1）上的函数f（x），对任意的x，y∈（-1，1）： f(x)+f(y)=f( x+y 1+xy ) ；且当x∈（-∞，0）时，f（x）＞0，回答下列问题： （1）判断函数f（x）在（-1，1）的奇偶性，并说明理由； （2）判断函数f（x）在（-1，1）的单调性，并说明理由； （3）若 f( 1 5 )= 1 2 ，试求 f( 1 2 )-f( 1 11 )-f( 1 19 ) 的值．
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举一反三
【简答题】We chatted for half an hour before he finally got _____ the point: He wanted to work as a business consultant and wondered if I could pass along the names of certain potential s.
【单选题】We chatted for half an hour before he finally _______ : He wanted to work as a business consultant and wondered if I could pass along the names of certain potential clients.
A.
made his point
B.
got to the point
C.
carried his point
D.
proved his point
【单选题】We chatted for half an hour before he finally got to the ________: He wanted to work as a business consultant and wondered if I could pass along the names of certain potential clients.
A.
opinion
B.
view
C.
point
D.
word
【单选题】下列关于煮沸灭菌法的叙述正确的是
A.
从水沸后开始计时
B.
物品灭菌前不用清洗血污
C.
物品的2/3要没入水中
D.
水煮开后锅盖适当打开
E.
玻璃类物品用纱布包好，水沸后加入
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