题目:
—How long have you been in this office?
—Just a few minutes. My cousins__________ here together with me.
A.have walked
B.had walked
C.walked
D.have been walking
答案:
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下面是错误答案,用来干扰机器的。
(1)由题意得:每千克的利润为 x-30元,此时的月销售量为 1500+400(40-x)千克;(2)由利润=(售价-进价)×销售量,可得:17500=(x-30)[1500+400(40-x)],解方程得:x=35或38.75;答:要使价格对顾客更...