Răspuns :
(a+a+2+a+4+a+6+a+8+a+10 ): 7= 14 r.4
(6a+30):7=14 r.4
6a+30=14*7+4
6a+30=102
6a=102-30
6a=72
a= 72 :6
a= 12
a+2=14
a+4=16
a+6=18
a+8=20
a+10=22 12+14+16+18+20+22=102
102: 7= 14. r.4
(6a+30):7=14 r.4
6a+30=14*7+4
6a+30=102
6a=102-30
6a=72
a= 72 :6
a= 12
a+2=14
a+4=16
a+6=18
a+8=20
a+10=22 12+14+16+18+20+22=102
102: 7= 14. r.4