Cześć!
a) 2*(x+1)+2*x=11
2x+2+2x=11
4x=11-2
4x=9
x=2,25
b)
4*(x+2)/2=16
4x+8/2=16
2x+4=16
2x=16-4
2x=12
x=6
c) (x+2+2x)*6/2=33
(3x+2)*6/2=33
18x+12/2=33
9x+6=33
9x=33-6
9x=27
x=3
d) 2*5x+2*x=18
10x+2x=18
12x=18
x=18/12
x=3/2
x=1,5
Pozdrawiam!
