1)5(х-0.2)=0
5х-1=0
5х=1
х=1/5
х=0.2
2)0.8(у-7)=8
0.8у-5.6=8
0.8у=8+5.6
0.8у=13.6
у=13.6/0.8
у=17
3)5х-1/8=3
5х=3+1/8
5х=3.125
х=3.125/5
х=0.625
4)4х-1.8=5.4
4х=5.4+1.8
4х=7.2
х=7.2/4
х=1.8
5)7.6+2х=10.6
2х=10.6-7.6
2х=3
х=3/2
х=1.5
6)10+3.25х=23
3.25х=23-10
3.25х=13
х=13/3.25
х=4
Х123456789
1 1,2,3,4,5,6,7,8,9
2 2,4,6,8,10,12,16,18
3 3,6,9,12,15,18,21,24,27
4 4,8,12,16,20,24,28,32,36
5 5,10,15,20,25,30,35,40,45
6 6,12,18,24,30,36,42,48,54
7 7,14,21,28,35,42,49,56,63
8 8,16,24,32,40,48,56,64,72
9 9,18,27,36,45,54,63,72