Răspunsuri

2014-05-27T20:21:12+03:00
0,(3)=3/9= 1/3
0,5=5/10=1/2

a,b  ip cu 1/2  1/3

a* 1/2 = b*1/3= k
a/2=b/3=k
a=2k
b=3k

ab>24

2k*3k >24
6k²>24 |:6
k² >4
k>2

a+b<20
2k+3k< 20
5k< 20 |:5
k <4

2< k <4   ⇒k=3

a=2*3=6
b=3*3=9