Răspunsuri

2014-02-25T20:09:34+02:00
13supra4=2x + 5 totul supra 4 ->
-> 4(2x + 5) = 13*4
8x + 20 = 52 
8x=52-20
8x=32
x=32/8
x=4
1 5 1
2014-02-25T22:26:30+02:00
13/4=2x+5/4
13/4-5/4=2x
13-5/4=2x
12/4=2x
12/4:2=x
12/4*1/2=x; simplificam pe 12 si cu 2 prin 2 si da 6/4*1/1
6/4*1/1=x
6/4=x
           R:x=6/4