37\%=0.37
50\%=0.5
4\%=0.04
135\%=1.35
3 * x1 = 2 * x2
5 * x2 = 4 * x3
11 * x3 = 6 * x4
x1 + x2 + x3 + x4 = 125
Выражаем: x2 = 1,5 * x1
x3 = 5 * x2 / 4 = 7,5 * x1 / 4 = 1,875 * x1
x4 = 11 * x3 / 6 = 11 * 1,875 * x1 / 6 = 3,4375 * x1
Итого: 125 = x1 + 1,5 * x1 + 1,875 * x1 + 3,4375 * x1 = 7,8125 * x1
x1 = 125 / 7,8125 = 16
x2 = 24
x3 = 30
x4 = 55
(1 1/3 + 2 4/5) : 6 1/5 = 2/3
1) 1 1/3 + 2 4/5 = 1 5/15 + 2 12/15 = 3 17/15 = 4 2/15
2) 4 2/15 : 6 1/5 = 62/15 : 31/5 = 62/15 * 5/31 = 2/3
(2 3/8 - 1 1/6) : 2 5/12 = 1/2
1) 2 3/8 - 1 1/6 = 2 9/24 - 1 4/24 = 1 5/24
2) 1 5/24 : 2 5/12 = 29/24 : 29/12 = 29/24 * 12/29 = 12/24 = 1/2
1 2/3 * 4/5 + 2/3 = 2
1) 1 2/3 * 4/5 = 5/3 * 4/5 = 4/3 = 1 1/3
2) 1 1/3 + 2/3 = 1 3/3 = 2
3 1/5 : 3/4 - 1/3 = 3 14/15
1) 3 1/5 : 3/4 = 16/5 : 3/4 = 16/5 * 4/3 = 64/15 = 4 4/15
2) 4 4/15 - 1/3 = 4 4/15 - 5/15 = 3 19/15 - 5/15 = 3 14/15
1) a)-4,2= -1,4+ (-1,4) + (-1,4); б) -4,2=4,2+(-8,4)
2) a) -6,3=-2,1 + (-2,1) + (-2,1); б) -6,3=6,3+(-12,6)