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METODA REDUCERII..........

METODA REDUCERII class=

Răspuns :

10x-12y=80
8x+6y=20      inmultim cu  2

10x-12y=80
16x+12y=40    le adunam membru cu mebru
10x+16x=80+40
26x=120    x=120/26=60/13
y=(40-16×60/13)/12=(520-960)/(13×12)=-440/156=-110/39