Răspuns :
(2a+2a+2+2a+4+2a+6)/4=89
8a+12=4*89
8a+12=356
8a=356-12
8a=344
a=43
2a=43*2=86
2a+2=88
2a+4=90
2a+6=92
8a+12=4*89
8a+12=356
8a=356-12
8a=344
a=43
2a=43*2=86
2a+2=88
2a+4=90
2a+6=92
(a + a+2 + a+4 +a+6) : 4 = 89
4a +12= 356
4a =344
a = 86
b= 88
c= 90
d= 92
Asta e corect !
4a +12= 356
4a =344
a = 86
b= 88
c= 90
d= 92
Asta e corect !