1+(?3)=?2,1+2=3,1+7=8=\r6+(-8)=-2,6+(?3)=?3,6+2=8,6+7=13.\r®C417,~12,~1,~2,3,8,13.\r±§¨%²¨ª«¬A?6cA®C416,-11,-6,-1,4,9,14=©¨\r%²¨ª«¬A?6cA®C415,-10,-5,0,5,10,15.³´µ¶?A\r·g*¸¹º;
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