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X+1 pe 5=3pe5, 9pe2+x=15pe2, x+5pe7=4pe3

Răspuns :

EagleEyes
x + 1/5 = 3/5
x = 3/5 - 1/5
x = (3-1)/5
x = 2/5

9/2 + x = 15/2
x = 15/2 - 9/2
x = ( 15-9)/2
x = 6/2
x = 3

x + 5/7 = 4/3
x = 4/3 - 5/7
x = (28-15)/21
x = 13/21
Pix20

[tex]\dfrac{x+1}{5}[/tex]=[tex]\dfrac{3}{5}[/tex]

5(x+1)=5·3
5x+5=15
5x=15-5

5x=10=>x=[tex]\dfrac{10}{5}[/tex]=2

[tex]\dfrac{9}{2+x}[/tex]=[tex]\dfrac{15}{2}[/tex]

9·2=15(2+x)
18=30+15x
-15x=30-18
-15x=12

x=[tex]\dfrac{12}{-15}[/tex]

[tex]\dfrac{x+5}{7}[/tex]=[tex]\dfrac{4}{3}[/tex]

3(x+5)=7·4
3x+15=28
3x=28-15
3x=13=>x=[tex]\dfrac{13}{3}[/tex]

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