1)(4 1/2-0,7)*(1,85+3/20) 2)(2,6+1 2/5)*(4-2 4/25) 3)(7 2/5+6,4):(5,2-2 9/10) 4)(14-2 3/10):(3/5+0,7)

Решаем следующий пример.1)(4 1/2-0,7)*(1,85+3/20) = (9/2 - 7/10) × (185/100 + 3/20) = (45/10 - 7/10) × (185/100 - 70/100) = 38/10 × 115/100 = 19/5 × 23/20 = 437/100 = 4,37.2)(2,6+1 2/5)*(4-2 4/25) = (26/10 + 7/5) × (4 - 54/25) = (26/10 + 14/10) × (100/25 - 54/25) == 40/10 × 46/25 = 4 × 46/25= 184/25 = 7,36.3)(7 2/5+6,4):(5,2-2 9/10) = (37/5 + 64/10) ÷ (52/10 - 29/10) = (74/10 + 64/10) ÷ 23/10 = = 10/10 × 10/23 = 1 × 10/23 = 10/23.4)(14-2 3/10):(3/5+0,7) = (140/10 - 23/10) ÷ (3/5 + 7/10 ) = 117/10 ÷ (6/10 + 7/10) = = 117/10 ÷13/10 = 117/10 × 10/13 = 9.