123+234+345+543+432+321怎样简便

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123+234+345+543+432+321怎样简便
123+234+345+543+432+321怎样简便

123+234+345+543+432+321怎样简便
123+234+345+543+432+321=(123+543)+(234+432)+(345+321)=666
×3=1998

123+234+345+543+432+321
=123+321+234+432+345+543
=444+555+888
=111(4+5+8)
=111*17
=1887