Răspuns :
a+b+c=720
a=4c
b=a-c=4c-c=3c(îl inlocuiesti pe a cu valoarea de mai sus)
4c+3c+c=720
8c=720
c=720:8=90
a=4•90=360
b=3•90=270
a+b+c=720
a=4c
b=a-c =4c-c=3c
4c+3c+c=720
8c=720
c=720:8
c=90
a=4c=4*90=360 a=360
b=3c=3*90=270 c=270
a=4c
b=a-c =4c-c=3c
4c+3c+c=720
8c=720
c=720:8
c=90
a=4c=4*90=360 a=360
b=3c=3*90=270 c=270