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Silvergreen2017
a fost răspuns

x:y+z:y=10, unde x+z=40. y=?

Răspuns :

Abc112
[tex]x \div y + z \div y = 10[/tex]

[tex] \frac{1}{y} (x + z) = 10[/tex]

[tex] \frac{1}{y} \times 40 = 10[/tex]

[tex] \frac{40}{y} = 10[/tex]

[tex]y = \frac{40}{10} [/tex]

[tex]y = 4[/tex]
Cocirmariadenis
x / y + z/ y = 10 ⇒ ( x + z) / y = 10 ⇒ x + z = 10 y 

x + z = 40 

x + z = 10 y = 40 ⇒ y = 40 : 10 ⇒ y = 4 

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