Question

Aflati-l pe x din proportiile
a)4x-7
supra =5 supra 24
5x+9
b)10x-21
supra =13 supra 21
8x+15
c)15x-32
supra=22 supra 23
9x+20
d)24-x
supra =2 supra 5
32+x
e)3x+10
supra=1 5 supra 6
5x-8
f) 35-4x
supra =3
20-3x

Answer 1

a)(4x-7)/(5x+9)=5/24
96x-168=25x+45
71x=213
x=3

b)(10x-21)/(8x+15)=13/21
210x-441=104x+195
106x=636
x=6

c)(15x-32)/(9x+20)=22/23
345x-736=198x+440
147x=1176
x=8

d)(24-x)/(32+x)=2/5
120-5x=64+2x
7x=56
x=8

e)(3x+10)/(5x-8)=1 5/6
(3x+10)/(5x-8)=11/6
18x+60=55x-88
37x=148
x=4

f) (35-4x)/(20-3x)=3
35-4x=60-9x
5x=25
x=5