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2014-10-02T19:59:16+03:00
  • Utilizator Brainly
2014-10-02T20:01:12+03:00
A+a+1+a+2=27
3a+3=27
3a=24
a=8 

a+1=9
a+2=10

===============================================
a+a+1+a+2+a+3+a+4=75
5a+10=75
5a=65
a=13

a+1=14
a+2=15
a+3=16
a+4=17

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a+a+2+a+4=78
3a+6=78
3a=72
a=24

a+2=26
a+4=28