Рис. 3.31
507. Решите

Ответ:

Пошаговое объяснение:

506)

1/10 + 1/2 + 2/5 = 1/10 + 5/10 + 4/10 = 10/10 = 1м длина домбры

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507)

1)

x + 7/12 = 3/4

x + 7/12 = 9/12

x = 9/12 - 7/12

x = 2/12

x = 1/6

2)

x - 1/6 = 1/9

x - 3/18 = 2/18

x = 2/18 + 3/18

x = 5/18

3)

x - 3/5 = 3/8

x - 24/40 = 15/40

x = 15/40 + 24/40

x = 39/40

4)

x + 5/24 = 7/12

x + 5/24 = 14/24

x = 14/24 - 5/24

x = 9/24

x = 3/8

5)

y + 2/7 = 1/3

y + 6/21 = 7/21

y = 7/21 - 6/21

y = 1/21

6)

x - 1/6 = 7/9

x - 3/18 = 14/18

x = 14/18 + 3/18

x = 17/18

7)

y - 3/8 = 5/32

y - 12/32 = 5/32

y = 5/32 + 12/32

y = 17/32

8)

y + 2/5 = 1/2

y + 4/10 = 5/10

y = 5/10 - 4/10

y = 1/10