1) 4 1/5:7/15:1/3= 21/5*15/7*3/1 (21:7=3, 15:5=3)= 3*3*3=27;
2) 4 1/5:(7/15:1/3)= 21/5:(7/15*3/1)= 21/5:7/5= 21/5*5/7= 21/7= 3;
3) (5 8/9:1 17/36+1 1/4):4 1/5= (53/9:53/36+5/4):21/5= (53/9*36/53+5/4):21/5= (4+5/4)*5/21= (16/4+5/4)*5/21= 21/4*5/21= 5/4= 1 1/4;
4) (2 1/4+4 5/6):3 2/5-3/4:3/5= (9/4+29/6):17/5-3/4*5/3= ((9*3+29*2)/12)*5/17-5/4= ((27+58)/12)*5/17-5/4= 85/12*5/17-5/4= 17*5/12*5/17-5/4= 25/12-5/4= (25-15)/12= 10/12= 5/6.
Капуста - х
картошка - х+3,6га
2х=24-3,6
2х=20,4
х=10,2га - капуста
10,2+3,6=13,8 га - картофель
1) 480:100=4.8
2) 4.8×32=153.6
9/25 х 25 5/9 = 9/25 х 230/9 = 9 1/5.