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1) El duplode un número,más3 esigual al cuádruplode este,menos7.Hallar el número.
2𝑥 + 3 = 4𝑥 − 7
3 + 7 = 4𝑥 − 2𝑥
10 = 2𝑥
5 = 𝑥
2) La terceraparte de unnúmero,aumentadoen5 esigual a la mitaddel número,disminuido
en4: Hallarel número.
𝑥
3
+ 5 =
𝑥
2
− 4
2𝑥 + 30 = 3𝑥 − 24
30 + 24 = 3𝑥 − 2𝑥
54 = 𝑥
3) Si a los2/3 de un númerose le quitasus 2/3, resulta16. Hallar dichonúmero.
2𝑥
3
−
𝑥
3
= 16
2𝑥 − 𝑥
3
= 16
𝑥
3
= 16
𝑥 = 48
4) La sumade cuatro númerosenterosconsecutivosesigual a18 vecesladiferenciaentre el
mayor y el menor.Hallarel menornúmero.
𝑥 + 𝑥 + 1 + 𝑥 + 2 + 𝑥 + 3 = 18((𝑥 + 3) − (𝑥))
4𝑥 + 6 = 18𝑥 + 54 − 18𝑥
4𝑥 + 6 = 54
4𝑥 = 54 − 6
4𝑥 = 48
𝑥 = 12

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Exp 8 evidencia

  • 1. 1) El duplode un número,más3 esigual al cuádruplode este,menos7.Hallar el número. 2𝑥 + 3 = 4𝑥 − 7 3 + 7 = 4𝑥 − 2𝑥 10 = 2𝑥 5 = 𝑥 2) La terceraparte de unnúmero,aumentadoen5 esigual a la mitaddel número,disminuido en4: Hallarel número. 𝑥 3 + 5 = 𝑥 2 − 4 2𝑥 + 30 = 3𝑥 − 24 30 + 24 = 3𝑥 − 2𝑥 54 = 𝑥 3) Si a los2/3 de un númerose le quitasus 2/3, resulta16. Hallar dichonúmero. 2𝑥 3 − 𝑥 3 = 16 2𝑥 − 𝑥 3 = 16 𝑥 3 = 16 𝑥 = 48 4) La sumade cuatro númerosenterosconsecutivosesigual a18 vecesladiferenciaentre el mayor y el menor.Hallarel menornúmero. 𝑥 + 𝑥 + 1 + 𝑥 + 2 + 𝑥 + 3 = 18((𝑥 + 3) − (𝑥)) 4𝑥 + 6 = 18𝑥 + 54 − 18𝑥 4𝑥 + 6 = 54 4𝑥 = 54 − 6 4𝑥 = 48 𝑥 = 12