Решите уравнение надо (дроби) 4/15 y = 2/5 7/8 y = 14 9/10 y = 4 1/2 (1/4+1/5) х = 1 4/5 (2 1/12 - 1 5/6) х = 3/4

(1/4+1/5) х = 1 4/5
(5+4)x/20 = 9/5
9x/20 = 9/5
9x = 20*9/5
9x = 4*9
x =  4*9/9
x = 4

(2 1/12 - 1 5/6) х = 3/4
(25/12 - 11/6)x =  3/4
(25 - 22)x/12 = 3/4
3x/12  =  3/4
3x = 12*3/4
3x = 9
x = 3

4/15 y = 2/5
4y/15 = 2/5
4y = 15*2/5
4y = 6
y = 1.5

7/8 y = 14
7y/8 = 14
7y = 14*8
y = 14*8/7
y = 16

9/10 y = 4 1/2
9y/10 = 9/2
9y = 9*10/2
9y = 45
y = 45/9
y = 5

1)14/15 у = 2/5

у = 2/5 : 4/15

у = 3/2 = 1целая 1/2

2)7/8у = 14

у = 14 : 7/8

у= 16

3)9/10у = 9/2

у = 9/2 : 9/10

у= 5

4)(1/4 + 1/5)х = 9/5

(5/20 + 4/20)х = 9/5

9/20х = 9/5

х= 9/5 : 9/20 = 4

5) (25/12 - 22/12)х = 3/4

1/4х = 3/4

х = 3/4 : 1/4

х = 3