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4a-b/a+b=5/3
Va roog mult!!​


Răspuns :

Răspuns:

Explicație pas cu pas:

[tex]\frac{4a-b}{a+b} =\frac{5}{3}[/tex]

[tex]\frac{4a+4b-5b}{a+b} =\frac{5}{3} \\[/tex]

[tex]\frac{4a+4b}{a+b}-\frac{5b}{a+b} =\frac{5}{3} \\[/tex]

[tex]\frac{4(a+b)}{a+b}-\frac{5b}{a+b} =\frac{5}{3} \\[/tex]

[tex]4-\frac{5b}{a+b} =\frac{5}{3} \\[/tex]

[tex]\frac{5b}{a+b} =4-\frac{5}{3} \\[/tex]

[tex]\frac{5b}{a+b} =\frac{12-5}{3} \\[/tex]

[tex]\frac{5b}{a+b} =\frac{7}{3} \\[/tex]

[tex]5b*3 = 7*(a+b)[/tex]

[tex]15b = 7a+7b[/tex]

[tex]7a = 15b - 7b[/tex]

[tex]7a = 8b[/tex]

[tex]a= \frac{8}{7} b[/tex]

Răspuns:

(4a-b)/(a+b)=5/3

5(a+b)=3(4a-b)

5a+5b=12a-3b

5b+3b=12a-5a

2b=7a

a/b=2/7

b/a=7/2