3/7 и 6/9
27/63 и 42/63
8/14 и 12/16
64/112 и 84/112
-2,5 - (-1 2/5 + 2 1/3)= -2,5 + 1 2/5 - 2 1/3= - 25/10+7/5-7/3=
= - 5/2 +7/5 -7/3 = -75/30+42/30-70/30= - 103/30 = - 3 13/30
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- 4,544 -2,76 + 1,386 = - 7,304 + 1,386 = - 5,918
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3 - 2/19-(-7/19 - 1 1/2 = 3-2/19+7/19+3/2 = 3-4/38+14/38+57/38 =
= 3 + 67/38 = 3 + 1 29/38 = 4 29/38
A) 699+1=700
б) 100-1=999
в)28999+1=30000
г)12000-1=11999