Вычислите : а) 1 7/9 - 5/9 б) 1 5/9 - 1 в) 2 4/9 - - вопрос №520541917959159124915912512 от SashaGirl13579 13.03.2023 05:05

Question

Математика: Вычислите : а) 1 7/9 - 5/9 б) 1 5/9 - 1 в) 2 4/9 - 1 5/9 г) 1 - 2/5 д) 12 - 2/5 е) 3 2/5 - 2 3/5 ж) 1 - 12/13 з) 11 - 12/13 и) 10 1/3 - 9 2/3 с решением, : с

SashaGirl13579 · Answer

а) 1 7/9 - 5/9 =16/9 - 5/9 = 16/9 - 5/9 = 11/9 = 1 2/9
б) 1 5/9 - 1=(14 × 1 - 1 × 9)/9 = 14/9 - 9/9 = 5/9
в) 2 4/9 - 1 5/9=22/9 - 14/9 = 22/9 - 14/9 = 8/9
г) 1 - 2/5 =(1 × 5 - 2 × 1)/5 = 5/5 - 2/5 = 3/5
д) 12 - 2/5=(12 × 5 - 2 × 1)/5 = 60/5 - 2/5 = 58/5 = 11 3/5
е) 3 2/5 - 2 3/5=17/5 - 13/5 = 17/5 - 13/5 = 4/5
ж) 1 - 12/13 =(1 × 13 - 12 × 1)/13 = 13/13 - 12/13 = 1/13
з) 11 - 12/13=(11 × 13 - 12 × 1)/13 = 143/13 - 12/13 = 131/13 = 10 1/13
и) 10 1/3 - 9 2/3 =31/3 - 29/3 = 2/3