A:How
B:Who
⑴____A. morning B. good C. afternoon
⑵____A. friend B. sister C. brother
⑶____A. this B. I C. you
⑷____A. is B. am C. be
⑸____A. he B. she C. my
(I)若曲线y= f(x)在点(1, f(1) )处的切线与X轴平行,求a:
(II)若 f(x) 在x=2处取得极小值,求a的取值范围。
应用乘法运算定律把8.5×10.1改写成( )式计算简便