某工程如果由一二三小队合干,要12天.由一三五小队干,要7天.由二四五小队合干,8天.一三四小队合干,要42天.求5个小队合干要几天完成?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 05:12:55
![某工程如果由一二三小队合干,要12天.由一三五小队干,要7天.由二四五小队合干,8天.一三四小队合干,要42天.求5个小队合干要几天完成?](/uploads/image/z/12236260-4-0.jpg?t=%E6%9F%90%E5%B7%A5%E7%A8%8B%E5%A6%82%E6%9E%9C%E7%94%B1%E4%B8%80%E4%BA%8C%E4%B8%89%E5%B0%8F%E9%98%9F%E5%90%88%E5%B9%B2%2C%E8%A6%8112%E5%A4%A9.%E7%94%B1%E4%B8%80%E4%B8%89%E4%BA%94%E5%B0%8F%E9%98%9F%E5%B9%B2%2C%E8%A6%817%E5%A4%A9.%E7%94%B1%E4%BA%8C%E5%9B%9B%E4%BA%94%E5%B0%8F%E9%98%9F%E5%90%88%E5%B9%B2%2C8%E5%A4%A9.%E4%B8%80%E4%B8%89%E5%9B%9B%E5%B0%8F%E9%98%9F%E5%90%88%E5%B9%B2%2C%E8%A6%8142%E5%A4%A9.%E6%B1%825%E4%B8%AA%E5%B0%8F%E9%98%9F%E5%90%88%E5%B9%B2%E8%A6%81%E5%87%A0%E5%A4%A9%E5%AE%8C%E6%88%90%3F)
某工程如果由一二三小队合干,要12天.由一三五小队干,要7天.由二四五小队合干,8天.一三四小队合干,要42天.求5个小队合干要几天完成?
某工程如果由一二三小队合干,要12天.由一三五小队干,要7天.由二四五小队合干,8天.一三四小队合干,要42天.求5个小队合干要几天完成?
某工程如果由一二三小队合干,要12天.由一三五小队干,要7天.由二四五小队合干,8天.一三四小队合干,要42天.求5个小队合干要几天完成?
1/X1+1/X2+1/X3=1/12 一,1/X1+1/X3+1/X5=1/7 二,1/X2+1/X4+1/X5=1/8 三,1/X1+1/X3+1/X4=1/42 四
一+二+三*2+四=1/12+1/7+2/8+1/42=1/2
1/X1+1/X2+1/X3+1/X4+1/X5=1/2÷3=1/6