Как решить уравнения? /72 = 7/8 4/5=/25 15/55=3/ /8=15/14 5/8=60/ /7=20/28

1)/72 = 7/8;

x = (72 * 7) : 8;

(72 * 7) : 8 = 504 : 8 = 63;

2)4/5 = /25;

x = (25 * 4) : 5;

(25 * 4) : 5 = 100 : 5 = 20;

3)15/55 = 3/;

x = (55 * 3) : 15;

(55 * 3) : 15 = 165 : 15 = 11.

4)/8 = 15/14;

x = (15 * 8) : 14;

(15 * 8) : 14 = 120 : 14 = 8,57.

5)5/8 = 60/;

x = (8 * 60) : 5;

(8 * 60) : 5 = 480 : 5 = 96.

6)/7 = 20/28;

x = (20 * 7) : 28;

(20 * 7) : 28 = 140 :28 = 5.

7)2/9 = ?/36;

? = (2 * 36) : 9;

 (2 * 36) : 9 = 72 : 9 = 8.

8)5/18 = ?/36;

? = (5 * 36) : 18;

(5 * 36) : 18 = 180 : 18 = 10.

9)3/4 = ?/72;

? = (3 * 72) : 4;

(3 * 72) : 4 = 216 : 4 = 54.

10)7/9 = ?/18;

? = (7 * 18) : 9;

(7 * 18) : 9 = 126 : 9 = 14.

11) 5/12 = ?/48;

? = (5 * 48) : 12;

(5 * 48) : 12 = 240 : 12 = 20.