.....................=1 1/4
1) 4 5/12 - 3 13/24=4 10/24 - 3 13/24=21/24=7/8
2) 7/8 : 1 3/4=7/8 * 4/7=1/2
3) 3 1/18 - 2 7/12=3 2/36 - 2 21/36=17/36
4) 17/36 :17/27=17/36 * 27/17=3/4
5) 1/2+3/4=2/4+3/4=5/4=1 1/4
|5х- 8| =12
5х- 8 =12 или 5х- 8 = - 12
5х = 20 5х = - 4
х = 4 х = - 0,8
Ответ: - 0,8 ; 4.
3(-2х+1)-2(х+13)=7х-4(1-х)
-6х+3-2х-26=7х-4+4х
-8х-26=11х-4
-19х=19
-х=1
х=-1
6+1+2-26=-7-4-4
-15=-15