В) 1 3/5 +2 2/3 г) 5 3/4 - 2 д) 3- 5/7 е) 4-1 - вопрос №77295311352235342357417932535413 от vorontsovaksus 18.12.2021 10:21

Question

Математика: В) 1 3/5 +2 2/3 г) 5 3/4 - 2 д) 3- 5/7 е) 4-1 7/9 ж) 3 2/5 - 3/5 з) 4 1/3- 1 1/2

vorontsovaksus · Answer

В) = 8/5 + 8/3 = (8*3 + 8*5)/3*5 = 8*8/15 = 64/15 = 4 4/15
г) = (5-2) + 3/4 = 3 +3/4 = 3 3/4
д) = 2 7/7 -5/7 = 2 +(7/7 -5/7) = 2 + 2/7 = 2 2/7
е) = 3 9/9 - 1 7/9 = (3 -1) + (9/9 -7/9) = 2 + 2/9 = 2 2/9
ж) = (2 +5/5 +2/5) - 3/5 = 2 +2/5 +(5/5 -3/5) = 2 +2/5 +2/5 = 2 4/5
з) = 13/3 - 3/2 = (13*2 -3*3)/6 = (26 -9)/6 = 17/6 = 2 5/6