Răspuns :
a+b+c=?
a+c=34⇒a+a+2=34⇔2a=34-2⇔2a=32⇔a=32:2⇔a=16
b=a+1⇒b=16+1⇔b=17
c=b+1⇔c=a+1+1⇔c=a+2⇔c=16+2⇔c=18
a+b+c=16+17+18=33+18=51
a+c=34⇒a+a+2=34⇔2a=34-2⇔2a=32⇔a=32:2⇔a=16
b=a+1⇒b=16+1⇔b=17
c=b+1⇔c=a+1+1⇔c=a+2⇔c=16+2⇔c=18
a+b+c=16+17+18=33+18=51