题目内容
计算:1+2+3+…+111+112+111+…+3+2+1=______.
1+2+3+…+111+112+111+…+3+2+1,
=(1+111)+(2+110)+…+56+112+(111+1)+(110+2)…+56,
=112×112,
=12544.
故答案为:12544.
=(1+111)+(2+110)+…+56+112+(111+1)+(110+2)…+56,
=112×112,
=12544.
故答案为:12544.
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