Помогите 478(a,b)475 и 476
475. V=4/9×3/4×1/3=1/9(м) 478. а)=9/56-(28/60-25/60)×(3/14+7/14)=9/56-(1/20×10/14)=9/56-1/28=9/56-2/56=7/56=1/8 б)=(16/24+21/24-20/24)×(17/17-5/17)=17/20×12/17=3/5