有理数的除法1. -0.5÷7/8×(-5/4)2. (-7)÷(-3/2)÷(-7/5)3. 3又1/3÷(-2又1/

1个回答

  • 1.-0.5÷7/8×(-5/4)

    =-1/2×8/7×(-5/4)

    =5/7

    2.(-7)÷(-3/2)÷(-7/5)

    =(-7)×(-2/3)×(5/7)

    =2/15

    3.3又1/3÷(-2又1/3)÷(1又1/5)

    =10/3÷(-7/3)÷(6/5)

    =10/3×(-3/7)×(5/6)

    =-25/21

    4.1÷【(-1)÷4/5】

    =1÷【(-1)×5/4】

    =1÷(-5/4)

    =1×(-4/5)

    =-4/5

    5.(-2/3)×8/27×(-1.5)÷(-16/9)

    =(-2/3)×8/27×(-3/2)×(-9/16)

    =-(2/3×8/27×3/2×9/16)

    =-6/5

    6.(-36)÷(1又1/2)×(-2/3)

    =(-36)÷3/2×(-2/3)

    =(-36)×2/3×(-2/3)

    =16

    7.(-2/3)×(-8/5)÷(-0.25)

    =(-2/3)×(-8/5)÷(-1/4)

    =(-2/3)×(-8/5)×(-4)

    =-64/15