January 2019 0 21 Report
 \left \{ {{3m+n=9} \atop {17y=0}} \right. \left \{ {{4a-2=b} \atop {3a+7b=1,5}} \right. \left \{ {{5x=4-2y} \atop {4x+y=3}} \right. matematyka kl 2 gim. zad5 str99 c),d),e) rozwiąż układy równań metodą podstawiania

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