5 4/7 - (2,5 + 1 1/3) : 1/3 = - 5 13/14
выражением:
= 5 4/7 - 5/2 * 3/1 - 4/3 * 3/1 =
= 5 4/7 - 7 1/2 - 4 =
= - (11 7/14 - 5 8/14) =
= - 5 13/14
по действиям:
1) 2,5 + 1 1/3 = 5/2 + 4/3 = 15/6 + 8/6 = 23/6 = 3 5/6
2) 3 5/6 : 1/3 = 23/6 * 3/1 = 23/2 = 11 1/2
3) 5 4/7 - 11 1/2 = 5 8/14 - 11 7/14 = - 5 13/14
30 5/6 - (7 1/3 +2 1/4) : 0,25 = - 7,5
выражением:
= 30 5/6 - ( 7 4/12 + 2 3/12) : 1/4 =
= 30 5/6 - 9 7/12 : 1/4 =
= 30 5/6 - 115/12 * 4/1 =
= 30 5/6 - 115/3 =
= 30 5/6 - 38 1/3 =
= - (38 2/6 - 30 5/6) =
= - 7 3/6 = - 7 1/2 = -7,5
по действиям :
1)7 1/3 + 2 1/4 = 7 4/12 + 2 3/12 = 9 7/12
2) 9 7/12 : 0,25 = 115/12 * 4/1 = 115/3 = 38 1/3
3) 30 5/6 - 38 1/3 = - (38 2/6 - 30 5/6) = - 7 3/6 = -7,5
5 3/4 - (3 2/3 + 1,5) : 1/3 = - 9,75
выражением:
= 5 3/4 - 11/3 * 3/1 - 3/2 * 3/1 =
= 5,75 - 11 - 4,5 =
= - (15,50 - 5,75) = - 9,75
по действиям:
1) 3 2/3 + 1,5 = 11/3 + 15/10 = 11/3 + 3/2 = (22 +9)/6 =
= 31/6 = 5 1/6
2) 5 1/6 : 1/3 = 31/6 * 3/1 = 31/2 = 15,5
3) 5 3/4 - 15,5 = - (15,5 - 5, 75) = - 9,75