Răspunsuri

2014-11-05T19:51:02+02:00
A+b=27
a=4/5b
din aceste doua rezulta dupa inlocuire

a+b=27
4/5b+b=27  aducem la numitor comun
4b+5b=135
9b=135
b=135:9
b=15  ⇒a=27-15=12
2014-11-05T19:55:07+02:00
Foate usor
1 nr-  |----|----|----|----|
2nr-   |----|----|----|----|----|
total-27
rez:
1)27:9=3(un segment)
2)3x4=12     1 nr
3)3x5=15      2 nr