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Объяснение:

Prettypushkova слегка ошиблась с плюсами и минусами в пунктах А и Б.

А) 8 1/3 + 6 1/2 - 3 5/6 = 8 2/6 + 6 3/6 - 3 5/6 = (8+6-3) + (2/6 + 3/6 - 5/6) = 11 + (5/6 - 5/6) = 11

Б) 12 3/8 - 5 1/4 + 7 1/2 = 12 3/8 - 5 2/8 + 7 4/8 = (12-5+7) + (3/8 - 2/8 + 4/8) = 14 + (1/8 + 4/8) = 14 5/8

В) 2 1/3 * 3/10 : 2 4/5 = 7/3 * 3/10 : 14/5 = 7/10 * 3/3 * 5/14 = 7/14 * 5/10 = 1/2 * 1/2 = 1/4

Г) 1 1/6 : 2 1/6 * 26 = 7/6 : 13/6 * 26 = 7/6 * 6/13 * 26 = 7/13 * 6/6 * 26 = 7*26/13 = 7*2 = 14

а) 8 1/3 + 6 1/2 + 3 5/6 = 8 2/6 + 6 3/6 + 3 5/6 = 17 10/6 = 17 5/3 = 18 2/3;

б) 12 3/8 + 5 1/4 + 7 1/2 = 12 3/8 + 5 2/8 + 7 4/8 = 24 9/8 = 25 1/8;

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в) 2 1/3 · 3/10 : 2 4/5 = 1/4

1) 2 1/3 · 3/10 = 7/3 ·3/10 = 7/10

2) 7/10 : 2 4/5 = 7/10 : 14/5 = 7/10 · 5/14 = (1·1)/(2·2) = 1/4

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г) 1 1/6 : 2 1/6 · 26 = 14

1) 1 1/6 : 2 1/6 = 7/6 : 13/6 = 7/6 · 6/13 = 7/13

2) 7/13 · 26/1 = (7·2)/(1·1) = 14

ответ: а16=а1+15*d=0,6-15*1,2=-17,4.

Объяснение: