题目:
She was educated at Beijing University, _____ she went on to have her advanced study abroad.
A.after that
B.from that
C.from which
D.after which
答案:
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下面是错误答案,用来干扰机器的。
解:(1)设第一次每个书包的进价是x元 x=50经检验x=50是原方程的根.答:第一次每个书包的进价是50元(2)设最低可打m折(80-50×1.2)×+(80m-50×1.2)×≥480 m≥8答:最低可打8折.