Răspunsuri

2014-03-04T07:56:26+02:00
22
a+b=30  =>b=30-a
4a+3b=100inlocuim 4a+3(30-a)=100
4a-90-3a=100   a=100-90  a=10
10+b=30  b=30-10  b=20  
23
|----|----| nr1
|----|----|----|+172000   422000-172000=250000
250000:5=50000un sg    50000x2=100000nr1    50000x3+172000=322000nr2
21
nr sunt74 si 40