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Mathematics, 23.01.2020 05:31 bri9263

Patricia compró 10 estampillas de correos unas de $3.00 y otras de $1.00. si pago con $18.00 en total. ¿cuántas pago por cada una? (hacer el problema con uno de los varios sistemas de ecuaciones)

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Patricia compró 10 estampillas de correos unas de $3.00 y otras de $1.00. si pago con $18.00 en tota...
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