<span>(17 : 3 2/5 - 6 3/8 : 3 3/8) : (1 1/5 - 29/30) = 13 1/3
1) 17 : 3 2/5 = 17/1 : 17/5 = 17/1 * 5/17 = 5/1 = 5
2) 6 3/8 : 3 3/8 = 51/8 : 27/8 = 51/8 * 8/27 = 51/27 = 1 24/27
3) 5 - 1 24/27 = 4 27/27 - 1 24/27 = 3 3/27 = 3 1/9
4) 1 1/5 - 29/30 = 6/5 - 29/30 = 36/30 - 29/30 = 7/30
5) 3 1/9 : 7/30 = 28/9 : 7/30 = 28/9 * 30/7 = 120/9 = 13 3/9 = 13 1/3 </span>
1день-543, 2 день- 2х, 3 день-х
<span>543+2х+х=1240,8</span>
3х=1240,8-543
3х=697,8
х=232,6
подставляем:
1)2*232,6=456,2 кг (второй день)
2)232,6 кг (третий день)
Ответ: 232,6 кг
0.55 (x+4) = 5.5(2x-3)
0.55x + 0.55*4 = 5.5*2x - 5.5*3
0.55x + 2.2 = 11x - 16.5
0.55x -11x = -16.5-2.2
-10.45x = -18.7
x= -18.7 : (-10,45)= 1870/1045 = 374/209 =34/19
х=1 15/19
•не ври про баллы
1.
1) 4+1/2=4 1/2=9/2
2) 3:9/2 = 3*2/9 = 2/3
3) 6-2/3 = 5 1/3 = 16/3
4) 4:16/3 = 4*3/16 = 3/4
5) 8+3/4 = 8 3/4 = 35/4
6) 7:35/4 = 7*4/35 = 4/5
7) 10-4/5 = 9 1/5 = 9,2
2.
1) 4-2/3 = 3 1/3 = 10/3
2) 2:10/3 = 2*3/10 = 3/5
3) 5-3/5 = 4 2/5 = 22/5
4) 11:22/5 = 11*5/22 = 5/2 = 2,5
5) 6-2,5 = 3,5 = 7/2
6) 7:7/2 = 7*2/7 = 2
7) 8-2 = 6