1.102,104,106,108,110,220,244,300,500,550,560,604,608,610,612,644,666,680
2.100,105,110,115,120,125,130.220,225,230,245,605,725,500,505,800,945,745
3.100,110,120,220,240,250,260,270,340,360,370,400,450,460,500,540,600,900
А) (-4+(-2))÷2=-2,5
б) (-8+3)/2=-2,5
в) (-0,7+(-0,1))/2=-0,4
г) (- \frac{2}{6} +(- \frac{1}{6} ))-2=-0,25
1/2х=5
х=5:1/2
х=10
1/2*10=5
5=5
1/5х=4
х=4:1/5
х=4*5/1
х=20
1/5*20=4
4=4
2х=0,6
х=0,6:2
х=0,3
2*0,3=0,6
0,6=0,6
9х=3
х=3/9
х=1/3
9*1/3=3
3=3
5х=1
х=1/5
5*1/5=1
1=1