86 oferta
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OFERTA
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Transcript of 86 oferta
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OFERTA
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• Oferta:El preu d’un ordinador i una impressora és de 900€. Si aprofitem una oferta, ens fan el 15% de descompte en l’ordinador i el 5% en la impressora, i ens estalviem 119€.Quins eren els preus?
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15%
5%
900 - 119
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• x + y 900 15 . x + 5 . y 119 100 100
15x + 5y 11900x + y 900 Mètode 15x + 5y 11900 de substitució.
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• x 900 – y15(900 – y) + 5y 11900 13500 – 15y + 5y 11900 -15y + 5y 11900 – 13500-10y -1600y -1600 160 x 900 – 160 740
-10
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El preus són :
ordinador 740
Impressora 160
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FI