А) 0.7³+2,1 = (7/10)³ + 21/10 = 343/1000 + 21/10 = 2443/1000 = 2 443/1000 = 2,443
б) 3,4-1.2² = 17/5 - (6/5)² = 17/5 - 36/25 = 49/25 = 1 24/25 = 1,96
в) 0,13² + 0,11² = (13/100)² + (11/100)² = 169/10000 + 121/10000 = 290/10000 = 29/1000 = 0,029
г)
д) 1,8² - 1,4² = (18/10)² - (14/10)² сократите их = (9/5)² - (7/5)² = 9²/5² - 7²/5² = 81/25 - 49/25 = 32/25 = 1 7/25 = 1,28 (не я решал)
е) 3,9² + 10,4 = (39/10)² + 104/10 = (39/10)² + 52/5 = 39²/10² + 52/5 = 1521/100 + 52/5 = 1521+1040/100 = 2561/100 = 25 61/100 = 25,61