6.设定义在区间(-a,a)上的函数$f(x)={log_{2015}}\frac{1+mx}{1-2015x}$是奇函数(a,m∈R,m≠-2015),则ma的取值范围是( )
A. | $(1,{2015^{\frac{1}{2015}}}]$ | B. | $(0,{2015^{\frac{1}{2015}}}]$ | C. | $(1,{2015^{\frac{1}{2015}}})$ | D. | $(0,{2015^{\frac{1}{2015}}})$ |
5.设函数f(x)定义域为R,f(2+x)=f(2-x),且当x≥2时,$f(x)={(\frac{1}{2})^x}$,则有( )
A. | $f(\frac{1}{2})<f(\frac{3}{2})<f(\frac{8}{3})$ | B. | $f(\frac{1}{2})<f(\frac{8}{3})<f(\frac{3}{2})$ | C. | $f(\frac{3}{2})<f(\frac{1}{2})<f(\frac{8}{3})$ | D. | $f(\frac{8}{3})<f(\frac{3}{2})<f(\frac{1}{2})$ |
4.函数f(x)=ax(a>0,a≠1)在区间[1,2]上的最大值是最小值的2倍,则a的值是( )
A. | $\frac{1}{2}$或$\sqrt{2}$ | B. | $\frac{1}{2}$或2 | C. | $\frac{1}{2}$ | D. | 2 |
3.三个数60.7,(0.7)6,log0.76的大小顺序是( )
A. | (0.7)6<60.7<log0.76 | B. | ${({0.7})^6}<{log_{0.7}}6<{6^{0.7}}$ | ||
C. | ${log_{0.7}}6<{({0.7})^6}<{6^{0.7}}$ | D. | ${log_{0.7}}6<{6^{0.7}}<{({0.7})^6}$ |
2.若函数f(x)满足$f(x)+2f(\frac{1}{x})={log_2}x$,则f(2)的值( )
A. | -2 | B. | -1 | C. | 1 | D. | 2 |
1.下列函数f(x)与g(x)是相同函数的是( )
A. | $f(x)=\sqrt{{{(x-1)}^2}}$;g(x)=x-1 | B. | $f(x)=\frac{{{x^2}-1}}{x-1}$;g(x)=x+1 | ||
C. | f(x)=lg(x+1)+lg(x-1);g(x)=lg(x2-1) | D. | f(x)=ex+1.ex-1;g(x)=e2x |
20.计算$7×{(\frac{49}{25})^{-(\frac{1}{2})}}-{8^{\frac{2}{3}}}$结果是( )
A. | -1 | B. | $\frac{1}{2}$ | C. | 1 | D. | 2 |
19.函数$f(x)=\frac{lg(x+2)}{x+1}$的定义域是( )
A. | (-∞,-1)∪(-1,+∞) | B. | (-2,+∞) | C. | (-2,-1)∪(-1,+∞) | D. | [-2,-1)∪(-1,+∞) |
18.已知集合M={x|0≤x≤2},N={x|x-2=0},则下列说法正确的是( )
0 251526 251534 251540 251544 251550 251552 251556 251562 251564 251570 251576 251580 251582 251586 251592 251594 251600 251604 251606 251610 251612 251616 251618 251620 251621 251622 251624 251625 251626 251628 251630 251634 251636 251640 251642 251646 251652 251654 251660 251664 251666 251670 251676 251682 251684 251690 251694 251696 251702 251706 251712 251720 266669
A. | N∈M | B. | N⊆M | C. | M⊆N | D. | M∈N |