obliczcie;
12/30-0,5=
prosze z całym dzialaniem
12/30-0,5=12/30-1/2=12/30-15/30=(-3/30)=(-1/10)=-0,1
12/30-0,5=12/30-5/10=4/10-1/2=4/10-5/10=1/10
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12/30-0,5=12/30-1/2=12/30-15/30=(-3/30)=(-1/10)=-0,1
12/30-0,5=12/30-5/10=4/10-1/2=4/10-5/10=1/10