Question

Determina numarul natural x astfel incat urmatoarele egalitati sa fie adevarate

Answer 1

a) 3 supra 5 = x supra 10 ;

3/5=x/10
5*x=3*10
5*x=30
x=30:5
x=6

b) 7 supra x = 21 supra 15 ;

7/x=21/15
21*x=7*15
21*x=105
x=105:21
x=5

c) x+2 supra x+7 = 3x+6 supra 48 .

(x+2)/(x+7)=3(x+2)/48
3(x+2)(x+7)=48(x+2)
3(x+7)=48
x+7=48:3
x+7=16
x=16-7
x=9