Question

Aflați "x" din proporțiile : a)2/3=10/x ; b) 4/x=8 ; c)2/5___x =1/4___10:(/< este supra /)

Answer 1

1.a)
2/3=10/3
x=10x3/2
x=30/2
x=15
b)4/x=8
x=4/8
x=0,5
c)2/5/x=1/4/10
2/5x=1/40
5x=80
x=80:5
x=16
d)3x-1/15=4/12
3x-1=15x4/12
3x-1=5
3x=5+1
3x=6
x=6:3
x=2