算有理数算式

48÷[(-2)^3-(-4)]
=48/(-8+4)
=48/(-4)
=-12
(-1)^3×(-5)÷[(-3)^2+2×(-5)]
=1*5/(9-10)
=5/(-1)
=-5
(-2/9)+(-7/9)-(-2)
=-2/9-7/9+2
=-1+2
=1
4.6-(-3/4+1.6-4)-3/4
=4.6+3/4-1.6+4-3/4
=3+4
=7
(1/2-3+5/6-7/12)÷(-1/36)
=(3/4-3)*(-36)
=(-9/4)*(-36)
=81
[3/4+(-1/2)-(-7/8)]÷(-7/8)
=(1/4+7/8)*(-8/7)
=-1/4*8/7-7/8*8/7
=-2/7-1
=-9/7