Выполни действия удобным способом. 7+8+3 9+9+1 4+7+6 3+5+5 18-9-8 12-3-2 15-8-5 14-7-4 9+7-9 12-6+4 17-8+1 13+7-3

Выполним действия удобным способом:

• 7 + 8 + 3 = 7 + 3 + 8 = 10 + 8 = 18
• 9 + 9 + 1 = 9 + 1 + 9 = 10 + 9 = 19
• 4 + 7 + 6 = 4 + 6 + 7 = 10 + 7 = 17
• 3 + 5 + 5 = 3 + (5 + 5) = 3 + 10 = 13
• 18 - 9 - 8 = 18 - (9 + 8) = 18 - 17 = 1
• 12 - 3 - 2 = 12 - (3 + 2) = 12 - 5 = 7
• 15 - 8 - 5 = 15 - (8 + 5) = 15 - 13 = 2
• 14 - 7 - 4 = 14 - (7 + 4) = 14 - 11 = 3
• 9 + 7 - 9 = 9 - 9 + 7 = 0 + 7 = 7
• 12 - 6 + 4 = 6 + 4 = 10
• 17 - 8 + 1 = 9 + 1 = 10
• 13 + 7 - 3 = 20 - 3 = 17