-4分之3乘(12+3之1+0.4),得-8.3,

问题描述:

-4分之3乘(12+3之1+0.4),得-8.3,

-3/4(12+1/3+0.4) =-3/4×12-3/4×1/3-3/4×2/5 =-9-1/4-3/10 =-9-0.25-0.3 =-9.55