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2014-11-09T17:48:43+02:00
Fie x si y nr.
x+y=450
x=4y
⇒4y+y=450⇔ 5y=450/:5 ⇔ y=90⇒ x=4·90⇔ x=360
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2014-11-09T17:49:08+02:00
X+y=450
x=4y
4y+y=450
5y=450
y=450:5
y=90
x+90=450
x=450-90
x=360
x=360    y=90
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