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2/5 : 4² - 0,8 = 2/5 : 16 - 0,8 = 0,025 - 0,8 = - 0,775
(2/3 - 0,5)² + 36 = (20/30 - 15/30)² + 36 = (1/6)² + 36 = 1/36 + 36 = = 36 1/36
4,8 : 6/7 + 1,5 × (1/3)² = 48/10 × 7/6 + 1,5 × 1/6 = 5,6 + 0,25 = 5,85
(2² - 3,6) × 1/4 = (4 - 3,6) × 0,25 = 0,4 ×0,25 = 0,1
(4 1/4 - 2,85)² = (4,25 - 2,85)² = (1,4)² = 1,96
3³ : [2,25 - (1/2)²] = 27 : [2,25 : 0,25] = 27 : 9 = 3
(1 2/5)² - 3 1/4 × 0,2 = 1,96 - 0,65 = 1,31