[(1又21/24-1又3/8+1/16-3/4）*（-4）^3]/521-（-7）/（1/2）*2怎么做

Answer 1

[(1又21/24-1又3/8+1/16-3/4）*（-4）^3]/5
=[1+7/8-1-3/8+1/16-6/8]*(-64)/5
=[1/16-4/16]*(-64)/5
=[3/16]*64/5
=12/5
21-（-7）/（1/2）*2
=21+7
=28