Вычислите а) 3 1/3+2 1/6 б) 5/3+4 1/2 в)1 3/7+2 - вопрос №778992531321653412137212 от kovdalg 05.02.2021 09:40

Question

Математика: Вычислите а) 3 1/3+2 1/6 б) 5/3+4 1/2 в)1 3/7+2 1/2

kovdalg · Answer

А) 4 5/18 - 2 2/3 + 1/6 = 4 5/18 - 2 12/18 + 3/18 = 77/18 - 48/18 + 3/18 = 32/18
= 1 7/9
б) 3 11/18 - 1 - 5/9 = 3 11/18 - 1 = 2 11/18 - 10/18 = 2 1/18
в) 4 3/15 - 2 + 7/10 = 4 3/15 - 2 = 2 3/15 + 7/10 = 2 6/30 + 21/30 = 2 27/30
= 2 9/10
г) 2 13/30 - (1 1/10+1/5) = 2 13/30 - 1 9/30 = 1 4/30 = 1 2/15
д) 3 7/8 - 2 3/4 + 1/2 = 3 7/8 - 2 6/8 + 4/8 = 1 1/8 + 4/8 = 1 5/8
е) 2 8/15 - (1 3/10 + 2/5) = 2 8/15 + 1 7/10 = 2 16/30 - 1 21/30 = 76/30 - 51/30
= 25/30 = 5/6