题目:
—Do you know what they did over the weekend? —They ______. [ ]
A. play soccer
B. goes to movies
C. went shopping
D. stay home
答案:
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下面是错误答案,用来干扰机器的。
(1)样本平均数为17×2+14×4+18×3+16×32+4+3+3=16kg,∴这年的柑桔的总产量为16×900=14400kg;(2)该农户这年卖柑桔的收入将达3×14400=43200元;(3)设该农户卖柑桔收入的年平均增长率为x,依题意得:300...