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10613106
MAPA MENTAL SISTEMES D'EQUACIONS
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Mind Map on MAPA MENTAL SISTEMES D'EQUACIONS, created by Nerea Salinas PeirÓ on 29/09/2017.
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Nerea Salinas PeirÓ
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Nerea Salinas PeirÓ
over 6 years ago
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Resource summary
MAPA MENTAL SISTEMES D'EQUACIONS
REDUCCIÓ
*Multiplicar o dividir les equacions per a que alguna de les incògnites tinga coeficient similar. *Sumar i restar les equacions l'incògnita similar sumarà 0.
x+y-9=0 -3x+y+6=0 -2x-15=0 -2x=15 x=15/2=7'5 -7'5+y-9=0 y=9+7'5=16'5
EXEMPLE:
IGUALACIÓ
*En cadascuna de les 2 equacions. *AÏllar una mateixa incognita. *Igualar les dos expressions.
EXEMPLE:
x+y-9=0 -3x+y+6=0 -x+9=-3x-6 2x=-15 x=-7'5 y=-X+9 y=-3X-6 y=7'5+9=16'5 y=22'5-6=16'5
SUBSTITUCIÓ
*D'una de les equacions. *Aïllar una de les incògnites. *Substituir l'incògnita aÏllada de l'altra equació.
EXEMPLE:
y=37-2x-115=0 x=+3y-115=0 x=3(37-2x)-115=0 -5x-4=0 5x=4 x=4/5=0'8
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