Решение:
14)
б)
((3 1/3 + 5 7/9) × 2 1/4 - 1 1/15 × ( 3 5/6 - 7/12 + 9 7/8)) × 16/39 = 9 1/9 × 2 1/4 - 1 1/15 × 13 1/8 =
= 20 1/2 - 14 = 6 1/2
в)
( 8 2/3 + 5 + 1 1/8 - 10: 2 2/3 ) / (8 1/2 - 5 3/4) = (11 1/24 ) / (2 3/4) = 11 1/24 ÷ 2 3/4 = 4 1/66
г)
(14 - ( 49 1/3 ÷ 16 - 14 ÷ 8 1/6 ) ×7) / ( 1 17/18 × (1 57/70+37/42+2 14/30)-10)= (14-(3 1/12 - 1 5/7) × 7) / ( 1 17/18 × 5 17/105 - 10) = ( 12 53/84 × 7) / ( 10 1/27 - 10) = (88 5/12) / (1/27) = 88 5/12 : 1/27= 2387 1/4
15)
а)
2×35×18 / 9×14×40 = 5×2 / 2 × 20 = 1/4
б)
19×8×5×11 / 22×4×20×19 = 2 / 2×4 = 1/4
в)
2×9×5×13×17 / 2×3×5×17= 39
16)
а)( 7 1/2 + 3 2/3) × 6 = 11 1/6 × 6 = 67