Вот: Сделала фото

№29

№86

№32

№90

№34

№93

Ответ:

В решении.

Пошаговое объяснение:

29)

2/3 * 5/5 = 10/15;

4/11 * 5/5 = 20/55;

7/12 * 5/5 = 35/60;

9/40 * 5/5 = 45/200.

86)

1/3 = 18:3*1 = 6/18;

1/2 = 18:2*1 = 9/18;

5/6 = 18:6*5 = 15/18;

21/54 = 18:54*21 = 7/18 (лучше сначала умножить, потом разделить);

1/9 = 18:9*1 = 2/18;

14/36 = 18:36*14 = 7/18.

32)

1/2 = 36:2*1 = 18/36;

2/6 = 36:6*2 = 12/36;

5/9 = 36:9*5 = 20/36;

1/12 = 36:12*1 = 3/36;

7/18 = 36:18*7 = 14/36.

90)

4/5 = 25:5*4 = 16/25;

3/7 = 9:3*7 = 9/21;

42/63 = 42*9:63 = 6/9;

15/55 = 55*3:15 = 3/11.

34)

х/5 = 4/20

х=5*4:20

х=1;

6/х = 18/30

х=6*30:18

х=10;

1/3 = 7/х

х=3*7:1

х=21;

42/78 = х/13

х=42*13:78

х=7.

93)

1) 35/(х+5) = 7/15

(х+5)*7 = 35*15

7х+35 = 525

7х=525-35

7х=490

х=70.

2) (4х-2)/63 = 2/9

(4х-2)*9 = 63*2

36х-18 = 126

36х=126+18

36х=144

х=4.