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