Răspunsuri

2014-06-14T19:43:59+03:00
X nr de copii
y pret minge
5x=y-15  I*(-1)
8x=y+18
-5x=-y+15
8x=y+18
----------------
3x=      33
x=11 copii
y=8x-18=88-18=70 lei costa mingea
2014-06-14T20:08:58+03:00