Math function test questions in senior one.
(1) From the meaning of the question, y =-x 3 is a decreasing function, so b =-a 3a =-b 3 can be solved as follows: a=0 b=0 or a=- 1 b= 1 or a =/kloc-0. A, so a=- 1, b= 1, so the interval satisfying the conditions is [- 1, 1](2) The function is not a monotone function. So if it is not a closed function (3), it is easy to know that the function is not monotonically increasing in the definition domain, so f(a)=a f(b)=b, that is, a = k+√ (a+2) a+2-√ (a+2)-k-2 = 0 let √ (a+2) = t.