II gimnazjum

Matematyka wokół nas 2

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Rozwiązanie 1

a1​=81​+x1​

0,81x=x−190

teraz mają 60 lat razem za 2 lata będą mieli  60=2+2=64lata

2300=1,15x

{x+2y=5⋅214x−y=213​

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M834 80h400000v40h-400000z'/></svg>​−y=−(5<svg xmlns="http://www.w3.org/2000/svg" width='400em' height='1.08em' viewBox='0 0 400000 1080' preserveAspectRatio='xMinYMin slice'><path d='M95,702
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M834 80h400000v40h-400000z'/></svg>​−2) x=2 y=6