помогите пожалуйста решить по действиям
Ответы
2.
(7 - 1, 5/9 : 7/24) : 20/27 = 2, 1/4
1) 1, 5/9 : 7/24 = 14/9 : 7/24 = 14/9 • 24/7 =
= 2 • 8 / 3 = 16/3
2) 7 - 16/3 = 21/3 - 16/3 = 5/3
3) 5/3 : 20/27 = 5/3 • 27/20 = 9/4 = 2, 1/4
3.
1, 31/35 : (2 - 8/9 : 1, 19/45) = 1, 13/35
1) 8/9 : 1, 19/45 = 8/9 : 64/45 = 8/9 • 45/64 =
= 5/8
2) 2 - 5/8 = 16/8 - 5/8 = 11/8
3) 1 31/35 : 11/8 = 66/35 • 8/11 = 6•8/35 =
= 48/35 = 1, 13/15
4.
(5, 1/16 - 1, 1/8) • (5/6 + 3/14) = 4, 1/8
1) 5, 1/16 - 1, 1/8 = 81/16 - 9/8 = 81/16 - 18/16 =
= 63/16
2) 5/6 + 3/14 = 35/42 + 9/42 = 44/42
3) 63/16 • 44/42 = 3 • 11 / (4 • 2) = 33/8 = 4, 1/8
5.
(2, 13/48 + 2, 5/12) : 3, 3/4 - 9, 3/4 : 12 = -1/16
1) 2, 13/48 + 2, 5/12 = 2, 13/48 + 2, 20/48 =
= 4, 33/48 = 4, 11/16
2) 4, 11/16 : 3, 3/4 = 75/16 : 15/4 = 75/16 • 4/15 =
= 3/4
3) 9, 3/4 : 12 = 39/4 : 12 = 13/16
4) 3/4 - 13/16 = 12/16 - 13/16 = -1/16