简单的高中数学。
1个回答
2016-06-11
展开全部
14. 1/2 , 1/4
15. (1){x/x<-1,x>=3}交{x/}x/-2<x<=3}为{x/-2<x<-1}
(2)a-3=-3时a=0 ,A={0,2,-3}, B={-3,-1,1} A交B={-3,-1,0,1,2}
2a-1=-3时,a=-1 ,A={1,1,-3}, B={-4,-3,2} A交B={-4,-3,1,2}
16.f(x+1)-f(x)=(2/(x+1))-x-1-(2/x-x)
=(2/(x+1))-1-2/x
=-1-2/(x+1)/x
当x>0时,f(x)单调递减
15. (1){x/x<-1,x>=3}交{x/}x/-2<x<=3}为{x/-2<x<-1}
(2)a-3=-3时a=0 ,A={0,2,-3}, B={-3,-1,1} A交B={-3,-1,0,1,2}
2a-1=-3时,a=-1 ,A={1,1,-3}, B={-4,-3,2} A交B={-4,-3,1,2}
16.f(x+1)-f(x)=(2/(x+1))-x-1-(2/x-x)
=(2/(x+1))-1-2/x
=-1-2/(x+1)/x
当x>0时,f(x)单调递减
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