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- 1已知一个两位数a,把它的十位上的数字与个位上的数字对调后,所得的新的两位数是b.
- 2a woman you know(knew) well would speak to you when you left the tent.应该用know还是knew,为什么?
- 3找规律填空:1,2/3,5/8,13/21,_.
- 4怎么用4条线把九个点连起来
- 5已知抛物线y2=-2px(p>0)的焦点F恰好是椭圆x2a2+y2b2=1的左焦点,且两曲线的公共点的连线过F,则该椭圆的离心率为( ) A.2+1 B.12 C.2−1 D.3−1
- 6he broke his l( ) last night.
- 7秋词 完整的诗
- 8一辆汽车每小时行驶45千米,3分之2小时行驶多少千米?30分钟可行驶多少千米?
- 9We live in building,but on floors.
- 10等比{an},a1=64,q≠1,a2 a3 a4分别是等差的第7项,第3项,第1项.(1)求an (2)设bn=log2 an 求{|bn