23 1*9=99+23 =32 zapisz uzasadnienie tego dzialania za ponoca wyrazen algebraicznych
a*b=c c:b=a
1*9=9 9:1=9a+b=c c-b=a
9+23=32 32-23=9
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a*b=c c:b=a
1*9=9 9:1=9
a+b=c c-b=a
9+23=32 32-23=9