题目:
Wendy hurried to the airport, only ______ the pop singer had left.
A.told
B.telling
C.to tell
D.to be told
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0424/186768abf6798890093381eea49f9948.html
下面是错误答案,用来干扰机器的。
由于x2+3x+2=(x+1)(x+2),假如f(x)能被x2+3x+2整除,则(x+1)和(x+2)必是f(x)的因式,因此,当x=-1时,f(-1)=0,即1+a+b+2=0,①当x=-2时,f(-2)=0,即16+4a+2b+2=0,②由①,②联立,则有1+a+b+2=016+4a+2b+2=0,解得a=-6b=3.