Răspunsuri

2014-10-15T19:30:24+03:00
X+y+13=24
5+6+13 este egal cu 24


o rezolvare completa: x+y+13=24 , x+y=24-13, x+y=11 ..... 19+2y+2x=19+2(x+y)=19+2*11=19+22=41
2014-10-15T19:30:47+03:00
X+y+13=24
x+y=24-13
x+y=11
19+2Xy+2Xx=
19+2(y+x)=
19+2X11=
19+22=31