一项工程,甲独做12天完成,乙独做15天完成,丙独做10天完成?1.甲乙合作3天,剩下的由乙、丙

3个回答

  • 1、(1-3*(1/12+1/15))÷(1/15+1/10)

    =(1-9/20)÷1/6

    =11/20*6

    =33/10

    (1-3*1/12)÷(1/15+1/10)

    =(1-1/4)÷1/6

    =3/4*6

    =9/2

    (1-3*1/12)÷(1/10+1/12+1/15)

    =(1-1/4)÷(1/4)

    =3/4*4

    =3