已知log63=a，则用a表示log62，表达式为log62=______．

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问题填空题

已知log₆3=a，则用a表示log₆2，表达式为log₆2=______．

答案

∵log₆3+log₆2=log₆6=1，而log₆3=a

∴a+log₆2=log₆6=1即log₆2=1-a

故答案为：1-a

单项选择题

作废的落地业务凭证必须（），不得随意销毁。

A、专夹保管

B、定期装订

C、可以不保存

D、随传票装订

选择题

Seventy percent of the students _____ taken part in the work and seventy percent of the work _____

been finished. [ ]

A. has, has

B. had , had

C. has, have

D. have, has