Răspunsuri

2014-06-09T17:10:14+03:00
20 este acel numar :):):)

50-2x=x:2
-2x=x:2-50
-x=x:4-50
De fapt e : 50-2x=x/2 => 100-4x=x =) 100=5x=> x=20
a+b+c = 180 ; a+b=90 ; b+c = 160
180-90=90
c=90
b+90=160
b=160-90
b=70
b+c=70+90=160
180-60=20
a=20
2014-06-09T22:10:36+03:00