uzasadnij prawdziwosc rownosci: (10a+5)*(10a+5)=100a*(a+1)+25
(10a+5)*(10a+)=100a*(a+1)=25100a2+50a+50a+25=100a2+100a+25100a2+100a+25=100a2+100a+25
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(10a+5)*(10a+)=100a*(a+1)=25
100a2+50a+50a+25=100a2+100a+25
100a2+100a+25=100a2+100a+25