Răspuns :
a+b+c= 360
2(a+b) = c
2a+2b+2c=720
c+2c =720
3c=720
c=720:3=240
a=c:8
a= 240:8
a= 30
b= 360-(240 +30)
b= 360 - 270
b= 90
a=30
b=90
c=240
2(a+b) = c
2a+2b+2c=720
c+2c =720
3c=720
c=720:3=240
a=c:8
a= 240:8
a= 30
b= 360-(240 +30)
b= 360 - 270
b= 90
a=30
b=90
c=240
a+b+c=360
c=8a
2(a+b)=c=>2a+2b=c
din prima relatie avem ca c=360-a-b
=>2a+2b=360-a-b
2a+a+2b+b=360
3a+3b=360/:3
a+b=120
a=120-b
stim ca c=360-a-b si a=120-b, inlocuim si rezulta c=360-(120-b)-b
c=360-120+b-b
c=240
stim ca c=8a=>240=8a
a=240:8=30
stim ca a+b+c=360
30+b+240=360
b=360-240-30=90
a=30
b=90
c=240
c=8a
2(a+b)=c=>2a+2b=c
din prima relatie avem ca c=360-a-b
=>2a+2b=360-a-b
2a+a+2b+b=360
3a+3b=360/:3
a+b=120
a=120-b
stim ca c=360-a-b si a=120-b, inlocuim si rezulta c=360-(120-b)-b
c=360-120+b-b
c=240
stim ca c=8a=>240=8a
a=240:8=30
stim ca a+b+c=360
30+b+240=360
b=360-240-30=90
a=30
b=90
c=240