Question

determinati x :
(1) x supra 2,8 = 3,5 supra 7
(2) 3x supra 2x+6 = 5 supra 9
(3) 0,5 supra 0,24 = x supra 18
(4) x supra x+7 = 15 supra 50

Answer 1

(1) x/2,8 = 3,5/7
x=2,8X3,5:7
x=9,8:7
x=1,4

(2) 3x/ 2x+6 = 5/9
9*3x=5*(2x+6)
27x=10x+30
27x-10x=30
17x=30
x=17/30
x=0,5(6)

3) 0,5/0,24 = x/18
x=0,5x18:0,24
x=9:0,24
x=37,5

(4) x/ x+7 = 15/50
50*x=15*(x+7)
50x=15x+105
50x-15x=105
35x=105
x=105:35
x=3