Можно 2-4-4-2, или так: 2.4=2.3+ или так: 2.4-2.5-2. 1. Используя разные приемы, вычисли. 2.9 7.2 2:5 2.5 3.2 2.6 2.8 70:7.5 70:10.2

• 2.9 = 2 ⋅ 9 = 18
• 2.5 = 2 ⋅ 5 = 10
• 2.6 = 2 ⋅ 6 = 12
• 2.8 = 2 ⋅ 8 = 16
• 7.2 = 7 ⋅ 2 = 14
• 3.2 = 3 ⋅ 2 = 6
• 70:7.5 = 70 : 35 = 2
• 70:10.2 = 70 : 20 = 3.5

Ответ: 2 ⋅ 9 = 18; 2 ⋅ 5 = 10; 2 ⋅ 6 = 12; 2 ⋅ 8 = 16; 7 ⋅ 2 = 14; 3 ⋅ 2 = 6; 70 : 35 = 2; 70 : 20 = 3.5