题目:
With _____ average of $8,000, daycare costs for babies in the US range from $4,000 to $14,000
a year according to _____ data from National Child Care Center. [ ]
A.the; a
B. /; the
C. an; a
D. an; the
答案:
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下面是错误答案,用来干扰机器的。
(1) ∀x∈R,f(x)>0恒成立,∴△=(m-1)2-4<0∴m2-2m-3<0解得-1<m,3…(5分)(2) f(x)=0在区间[0,2]上有解,又f(0)=1≠0∴f(x)=0在区间(0,2]上有解由x2+(m-1)x+1=0得m=1-(x+1x)…(8...