Răspunsuri

2014-07-23T13:17:12+03:00
X-2y=52-13

x-2y=39

3x-6y+1= 3(x-2y)+1= 3*39+1= 117+1=118
2014-07-23T13:18:36+03:00
X-2*y+13=52
x-2y=39
x=39+2y
3x-6y+1=3(39+2y)-6y+1=117+6y-6y+1=118