Question

Aflati ce numarul natural x astfel incat fiecare dintre urmatoarele egalitati sa fie adevarate : 3/5=x/10 ; 7/x=21/15 ; x + 2/ x + 7 = 3x+ 6/48

Answer 1

x=ori

3/5=X/10             

3 x 10=5 x X       

30=5X   

X=30 : 5

X=6

7/X=21/15

7 x 15 = 21 x X

105 = 31 x X

X=105 : 21

X=5

X + 2/X +7 = 3X + 6/48

X + 2 x 48 =X + 7 x 3X + 6

X + 96 = X + 21 x X + 6

X=96-21-6

X=69