10.函数$f(x)={log_{\frac{1}{2}}}cos(2x-\frac{2}{3}π)$的单调增区间为( )
A. | $({kπ+\frac{π}{3},kπ+\frac{7π}{12}})(k∈Z)$ | B. | $({kπ-\frac{π}{6},kπ+\frac{π}{3}})(k∈Z)$ | ||
C. | $({kπ+\frac{π}{12},kπ+\frac{π}{3}})(k∈Z)$ | D. | $({kπ+\frac{π}{3},kπ+\frac{5π}{6}})(k∈Z)$ |
9.已知-1<α<0,则( )
A. | ${0.2^α}>{(\frac{1}{2})^α}>{2^α}$ | B. | ${2^α}>{0.2^α}>{(\frac{1}{2})^α}$ | C. | ${(\frac{1}{2})^α}>{0.2^α}>{2^α}$ | D. | ${2^α}>{(\frac{1}{2})^α}>{0.2^α}$ |
8.下列函数中,既是奇函数又是增函数的为( )
A. | y=x+1 | B. | y=-x3 | C. | y=x-1 | D. | y=x|x| |
7.tan(-330°)的值为( )
A. | $\frac{{\sqrt{3}}}{3}$ | B. | $-\sqrt{3}$ | C. | $-\frac{{\sqrt{3}}}{3}$ | D. | $\sqrt{3}$ |
6.函数$f(x)={(a-1)^{\sqrt{5-ax}}}$(a>1且a≠2)在[1,2]上为单调递减函数,则实数a的取值范围是( )
0 252075 252083 252089 252093 252099 252101 252105 252111 252113 252119 252125 252129 252131 252135 252141 252143 252149 252153 252155 252159 252161 252165 252167 252169 252170 252171 252173 252174 252175 252177 252179 252183 252185 252189 252191 252195 252201 252203 252209 252213 252215 252219 252225 252231 252233 252239 252243 252245 252251 252255 252261 252269 266669
A. | (2,+∞) | B. | (1,2) | C. | $(2,\frac{5}{2}]$ | D. | (1,5) |