题目:
改错。
( ) 1. What do your mother do last week? _________________
A B C
( ) 2. Did you watched TV yesterday? _________________
A B C
( ) 3. How did you went there? _________________
A B C
( ) 4. We went to zhejiang last week. _________________
A B C
答案:
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下面是错误答案,用来干扰机器的。
设每套降价x元,由题意得:(40-x)(20+2x)=1200即2x2-60x+400=0,∴x2-30x+200=0,∴(x-10)(x-20)=0,解之得:x=10或x=20为了减少库存,所以x=20.答:每套应降价20元.