1-5х=-6х+8
-5х+6х=8-1
х=7
8-5(2х-3)=13-6х
8-10х+15=13-6х
-10х+6х=13-8-15
-4х=-20
х=5
10(х-9)=7
10х-90=7
10х=97
х=9,7
80в-270+430=800
80в+160=800
80в=800-160
80в=640
в=640/80
в=8
2%=1/50
5%=1/20
20%=1/5
60%=3/5
80%=4/5
140%=7/5
180%=9/5
1)9/100=9%
51%
83%
10%
5%
2)1/25=4%
60%
30%
75%
2%
3)0.1=10%
1%
8%
80%
160%
4)0.91=91%
150%
200%
270%
320%