Question

gaseste nr,,a" in caurile a-12=b b-12=c c-12=d d-12=21

Answer 1

d=21+12=>d=33
c-12=33=>c=33+12=>c=45
b-12=45=>b=45+12=>b=57
a-12=57=>a=57+12=>a=69

Answer 2

d=21+12
d=33
apoi avem c-12=d
deci c-12=33
c=33+12
c=45
apoi avem b-12=c
deci b-12=45
b=45+12
b=57
acum avem a-12=b
deci a-12=57
a=57+12
a=69