Răspunsuri

2014-07-24T15:21:55+03:00
x/y=4/9 
9x=4y
x=4y/9

4x+6//x+y =?
4*4y/9+6  // 4y/9+y=
16y/9+6 // 4y/9+y= 
16y+54 /9  // 4y+9y /9=
16y+54 /9 * 9/13y=   9 cu 9 se simplifica
16y+54/13y

// inseamna linia de fractie principala
1 5 1