几道简单的的计算题

问题描述:

几道简单的的计算题
(-1/15-5/6-7/12+4-9)*(-30)
打错了 +4/9

(-1/15-5/6-7/12+4/9)*(-30)
=[-1/15-1/2-1/3-1/3-1/4+4/9]*[-30]
=[-1/15-3/4-2/3+4/9]*[-30]
=1/15*30+3/4*30+2/3*30-4/9*30
=2+45/2+20-40/3
=187/6