2200/5460*2730/1375= 8/10= 4/5
5610/2310:3822/4459= 5610/2310*4459/3822= 17/6= 2 5/6
8-5х= 2(х+2)+(4х+2)*2
8-5х=2х+4+8х+4
-5х-2х-8х=4+4-8
-15х=0
Х=0
3) по действиям
1) 3/4+0,7-1/10= 30/40+28/40-4/40= 54/40= 27/20= 1 7/20
2) 1 7/20*2 2/9= 27/20*20/9= 3
3)3:0,25= 300:25= 12