(1/12 + 1/6) : ( 3/8 - 1/4) = (1/12 + 2/12) : ( 3/8 - 2/8) = 3/12 : 1/8 = 1/4 х 8/1 = 2.
( 1 - 4/9) : (1/3 - 1/4) = 5/9 : ( 4/12 - 3/12) = 5/9: 1/12 = 5/9 х 12/1 = 20/3 = 6 2/3.
(1/3 - 5/16):(1/6 - 1/8)= (16/48 - 15/48):(4/24-3/24)= 1/48:1/24= 1/48 х 24/1 = 1/2.
(5/7-2/3):(4/9-5/12) = (15/21-14/21):(16/36-15/36)= 1/21:1/36= 1/21х36/1=36/21=12/7= 1 5/7.
-9*(-7+12):15+4=1
изменил, посчитал не правильно.
6 га=600 сот.
600:12=50 (раб.)
Ответ: участки получили 50 рабочих.
-6•(2/3а-1/6)+4•(3/4а-1/12)= -6*2/3а+6*1/6+4*3/4а-4*1/12=
=-<span>4а+1+3а-1/3=-а+2/3</span>
14/18=7/9
5=45/9
2/3=6/9
17/51=3/9
12/27=4/9
1/3=3/9
10/15=2/3=6/9
2 4/12=28/12=7/3=21/9
16/18=8/9
2/6=1/3=3/9
20/36=5/9
3/4=18/24
1=24/24
46/48=23/24
1/8=3/24
1/3=8/24
10/48=5/24
1/6=4/24
2/3=16/24
5/8=15/24
1/4=6/24
3/8=9/24
6/56=3/28
13/14=26/28
4/7=16/28
1/2=14/28
9/14=18/28
10=280/28
3/4=21/28
11/14=22/28
46/56=23/28
3/7=12/28
2/7=8/28