l’espressione - altervista€¦ · diapositiva 1 author: francesco created date: 11/25/2013...
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L’espressione precedentemente scritta si definisce
“potenza”.
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Il numero “10” è detto “base” della
potenza.
Il numero “3” è detto “esponente”.
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Come si scrive una potenza del
dieci sotto forma di numero?
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Si scrive “uno” seguito da tanti zeri quanti ne
indica l’esponente.
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310Si scrive “1” seguito da tre zeri.
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1000103 Cifra “uno”. Numero di zeri quanti ne indica l’esponente
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Potenze con esponente negativo.
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310
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L’espressione precedente è un
esempio di potenza con esponente negativo.
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Il numero “10” è detto “base” della
potenza.
Il numero “-3” è detto “esponente”.
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Come si scrive una potenza del dieci,
con esponente negativo sotto
forma di numero?
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Si scrive “0,”seguito da
un certo numero di zeri e
dall’unità!
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Il numero di zeri compresa la cifra “uno” deve essere pari all’esponente.
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001,010 3
Tre cifre decimali in tutto! Compresa l’unità!
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Prodotto di potenze di
uguale base.
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Il prodotto di due potenze aventi la stessa base, da luogo a una potenza, …….
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avente la stessa base e come esponente la
somma algebrica degli esponenti.
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743 101010 Si sommano gli esponenti: 4+3=7
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473 101010
ATTENZIONE!!!!!
473
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La somma degli
esponenti è algebrica!!!!!
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Rapporto di potenze di
uguale base.
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4
3
10
10
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REGOLA PRATICA
Il rapporto si trasforma in prodotto …..
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La potenza a denominatore si
porta al numeratore
cambiando di segno l’esponente.
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4
3
10
10
Diventa 43 1010
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101010 43
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ESEMPIO 31010
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31010 E’ COME SE L’ESPONENTE FOSSE “UNO”
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31010 1
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431 101010