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Metodes de Equacions
Description
Mind Map on Metodes de Equacions, created by GRIGORE GEORGE BUJOR on 04/10/2017.
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GRIGORE GEORGE BUJOR
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GRIGORE GEORGE BUJOR
almost 7 years ago
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Resource summary
Metodes de Equacions
Subsititució
- D'una de les equacions, aillar una de les incognites
-Sustituir la incognita aillada de l'altra equació
Exemple: 2y+y=37 x+3y-115=0 y=37-2x x+3(37-2x)-115=0 x+111-6x-115=0 -5x-4=0 -4=5x -4/5=x y=37+8/5
Reducció
-Multiplicar o dividir les equacions.per a que alguna de les incognites tingen coeficient similar - Sumar o restar les equacions. l'incognita similar sumara
Exemple: x+y-9=0 - (3x+y+6=0 -2x-15=0 -2x=15 x=15/2 x=7.5
Igualació
-En cadascuna de les dos equacions aillar una materia incognita -Igualar les dos expresions
Exemple: x+y-9=0 3x+y+6 y=-x+9 y=-3x-6 -x+9=-3x-6 -x+3x=-6-9 +2x=-15 x=-15/2 x=7.5 y=7.5+9=16.5 y=22.5-6=16.5
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