1.
[tex]I.2a+7\\II.32+m\\III.\frac12b[/tex]
2.
[tex]I.4x+7=4*3+7=12+7=19\\II.2(f+4)=2(-1+4)=2*3=6\\III.2a+3b-22=2*1+3*3-22=2+9-22=11-22=-11[/tex]
3.
[tex]I.5+3y-2+6y=9y+3\\II.8,23-z-11,13+0,5z=-0,5z-2,9[/tex]
4.
[tex]0,25x:2=0,250x:2=0,125x\\6y*0,3=1,8y[/tex]
