Mathematics, 06.07.2019 01:30 derekmartinez

Tenho que compra lápis e canetas. se comprar sete lápis e três canetas, gastarei r$16,50. se comprar cinco lápis e quatro canetas, gastarei r$15,50. qual o preço de cada lápis e de cada caneta?

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Tenho que compra lápis e canetas. se comprar sete lápis e três canetas, gastarei r$16,50. se comprar...

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