вычислите: а) 4 5/18-2 2/3+1/6 б) 3 11/18-1-5/9 в)4 3/5-2+7/10 г) 2 13/30-(1 1/10+1/5)...

Question

вычислите:

а) 4 5/18-2 2/3+1/6 б) 3 11/18-1-5/9 в)4 3/5-2+7/10 г) 2 13/30-(1 1/10+1/5) д)3 7/8-2 3/4+1/2 е) 2 8/15-(1 3/10+2/5)

Answer 1

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