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2014-05-14T15:03:15+03:00
A+B+C=26
 B=3A      A=B/3
C=B+5

 \frac{B}{3} +B+B+5=26
 \frac{B}{3} +2B+5=26


 \frac{B+6B+15}{3} =26

7B+15=26*3
7B=78-15
7B=63
B=9

C=9+5=14

A=9/3=3



A+B+C=26

B=3A

C=B+5

A /..../
B /..../...../...../
C /..../..../....../ +5
...............................=26

26-5=21
21:7=3 (un segm. A)
B=3A
B=9
C=B+5
C=9+5
C=14
2014-05-14T15:07:04+03:00

a+b+c=26

b=3a

c=b+5=>c=3a+5

a+3a+3a+5=26

7a=26-5

7a=21

a=21:7

a=3

b=3x3

b=9

c=9+5

c=14