По одну сторону от прямой, содержащей отрезок AC, отмечены точки B и K так, что AB=CK, AK=CB, ∠BAC=79∘, ∠BCA=31∘. Чему равна градусная мера ∠BAK?

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1) (7/15 - 1/6) + 2/5 = 21/30 = сокр. 7/10

1 действие: 7/15 - 1/6 = 14/30 - 5/30 = 9/30

2 действие: 9/30 + 2/5 = 9/30 + 12/30 = 21/30 = сокр. 7/10

2) (3/8 - 1/9) + 25/36 = 69/72 = сокр. 23/24

1 действие: 3/8 - 1/9 = 27/72 - 8/72 = 19/72

2 действие: 19/72 + 25/36 = 19/72 + 50/72 = 69/72 = сокр. 23/24

3) (8/9 - 5/6) + 2/3 = 13/18

1 действие: 8/9 - 5/6 = 16/18 - 15/18 = 1/18

2 действие: 1/18 + 2/3 = 1/18 + 12/18 = 13/18

4) (7/8 - 13/20) + 9/10 = 1 целая 5/40 = сокр. 1 целая 1/8

1 действие: 7/8 - 13/20 = 35/40 - 26/40 = 9/40

2 действие: 9/40 + 9/10 = 9/40 + 36/40 = 45/40 = 1 целая 5/40 = сокр. 1 целая 1/8

5) (7/18 - 1/12) + 5/6 = 1 целая 5/36

1 действие: 7/18 - 1/12 = 14/36 - 3/36 = 11/36

2 действие: 11/36 + 5/6 = 11/36 + 30/36 = 41/36 = 1 целая 5/36

6) (3/4 - 8/15) + 17/26 = 1 целая 1/260

1 действие: 3/4 - 8/15 = 45/60 - 24/60 = 21/60 = 7/20

2 действие: 7/20 + 17/26 = 91/260 + 170/260 = 261/260 = 1 целая 1/260

Пошаговое объяснение:

Пошаговое объяснение:

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