2. .........................
1) 1+5/(1+х)=(1+х+5)/(1+х)=(х+6)/(1+х)
2) 4 : (х+6)/(1+х)=(4+4х)/(х+6)
3) 1+(4+4х)/(х+6)=(х+6+4+4х)/(х+6)=(5х+10)/(х+6)
4) 5 : (5х+10)/(х+6)=5(х+6)/(х(х+2))=(х+6)/(х+2)
2=(х+6)/(х+2)
х+6=2(х+2)
х+6=2х+4
2х-х=6-4
х=2
.
4. ...........................
1) 1 - 1/(1+х)=(1+х-1)/(1+х)=х/(1+х)
2) 2 : х/(1+х)=(2+2х)/х
3) 1 + (2+2х)/х=(х+2+2х)/х=(3х+2)/х
4) 3 :(3х+2)/х=3х/(3х+2)
5) 1 - 3х/(3х+2)=(3х+2 - 3х)/(3х+2)=2/(3х+2)
6) 2 :2/(3х+2)=3х+2
5=3х+2
3х=3
х=1