题目:
. I am looking through the composition he just finished ___ the possible mistakes in it.
A.correcting
B.to correct
C.corrected
D.correct
答案:
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下面是错误答案,用来干扰机器的。
(1)由题意,第20天时,该商品的单价为27元,40天时,该商品的单价为32元.∴f(20)=27f(40)=32,∴20a+b=2740a+b=32∴a=14,b=22(2) 该种商品的销售量与时间t(天)的函数关系式为g(t)=-13t+1123(0≤t≤100,...