(1 2/3+х)-4=5 1/3
1 2/3+x=5 1/3+4
x=9 1/3-1 2/3
x=28/3-5/3
x=23/3=7 2/3
(1 3/5+у)-2=2/5
8/5+y=2 2/5
y=12/5-8/5=4/5
(10/21-у)+1=1 1/3
10/21-y=1/3
y=10/21-7/21=3/21=1/7
(8/15-х)+3=7/3
8/15-x=7/3-9/3
8/15-x= -2/3
x=10/15-8/15
x=2/15
1) 5(х - 0,2) =0
5х - 1 = 0
5х = 0 + 1
5х = 1
х = 1/5
х = 0,2
2) 0,8(у - 7) = 8
у - 7 = 8 ÷ 0,8
у - 7 = 10
у = 10 + 7
у = 17
3) 5х - 1/8 = 3
5х - 0,125 = 3
5х = 3 + 0,125
5х = 3,125
х =0,625
4) 4х - 1 4/5 = 5,4
4х - 1,8 = 5,4
4х = 5,4 + 1,8
4х = 7,2
х = 1,8
5) 7 3/5 + 2х = 10,6
7,6 + 2х = 10,6
2х = 10,6 - 7,6
2х = 3
х = 3/2
х = 1 1/2
х = 1,5
6) 10 + 3 1/4х = 23
10 + 3,25х = 23
3,25х = 23 - 10
3,25х = 13
х = 4
X * [ 2 ( 3/4 ) - 1 + 1 ( 1/16 ) } = X * [ 2 ( 12/16 ) - 1 + 1 ( 1/16 ) ] =
= X * [ 1 ( 12/16 ) + 1 ( 1/16 ) ] = X * 1 ( 13/16 ) = X * 29/16
X = 32/45
32/45 * 29/16 = 58/45 = 1 ( 13/45 )
№ 1. 9 : 6 1/4 * 2 1/2 : 3/5 = 6
1) 9 : 6 1/4 = 9 : 25/4 = 9 * 4/25 = 36/25
2) 36/25 : 2 1/2 = 36/25 * 5/2 = (18*1)/(5*1) = 18/5
3) 18/5 : 3/5 = 18/5 * 5/3 = 18/3 = 6
№ 2. 1 5/6 : 2 1/3 * 3 3/4 * 4 1/5 = 43 целых 5/16
1) 1 5/6 : 2 1/3 = 11/6 : 7/3 = 11/6 * 3/7 = (11*1)/(2*7) = 11/14
2) 11/4 * 3 3/4 = 11/4 * 15/4 = 165/16
3) 165/16 * 4 1/5 = 165/16 * 21/5 = (33*21)/(16*1) = 693/16 = 43 5/16