The New Year is coming. In the coming year I have many plans. Do you want to know about my plans?
Now I'll tell you. Firstly, I am going to take more exercise to keep fit. Secondly, I am going to study harder at school to g
发育不经过蛹期的昆虫是( )
商店运来4盒皮球,每盒6个,又卖出8个,商店还剩16个皮球.
转动转盘的次数n
100
150
200
500
800
1000
落在“铅笔”区域的次数m
68
108
140
355
560
690
落在“铅笔”区域的频率 mn
0.68
0.72
0.70
0.71
0.69
(Ⅰ)求f(x)的解析式;
(Ⅱ)已知f( a2 + π12 )= 1013 ,﹣ π2 <a<0,求cos(a﹣ 3π4 )的值.