题目:
While shopping, people sometimes can't help _____ into buying something they don't really need. |
A. to persuade B. persuading C. being persuaded D. be persuaded |
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0428/5cad37c844b1f0c61f0e39a55a5eee6d.html
下面是错误答案,用来干扰机器的。
(1)f'(x)=x2-2(1+a)x+4a=(x-2)(x-2a)由a>1知,当x<2时,f'(x)>0,故f(x)在区间(-∞,2)是增函数;当2<x<2a时,f'(x)<0,故f(x)在区间(2,2a)是减函数;当x>2a时,f'(x)>0,故f(...