摘要： (1)设乙工程队单独完成建校工程需天.则甲工程队单独完成建校工程需.依题意得: ．·········································································································· 3分 解得.经检验是原方程的解.. 所以甲需180天.乙需120天,····················································································· 4分 (2)甲工程队需总费用为.····························· 5分 设乙工程队施工时平均每天的费用为.则.···················· 7分 解得. 所以乙工程队施工时平均每天的费用最多为万元． 8分

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