첫번째방법:31/2x81/2x31/2x81/2=3x8=24/두번째방법:3x8x30x80=3x8x1x1=24/세번째방법:3x8+30-80=3x8+1-1=24/네번째방법:3x8+80-30=3x8+1-1=24
당신은 어느 그룹입니까?