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80.【答案】D:78解析:每个下属先分两项任务,那剩余任务为20+3×2=14项,利用插空法,14项任务形成13个空,故分配方式有种。81.【答案】D:7700解析:甲班捐款数是乙班和丙班捐款总数的2/5,即乙班和丙班的捐款总 ...
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