51×52-1-3-5-7-9……-101简便计算?
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51×52-(1+3+5+7+9+……+101)(说明:51个连续奇数)
=51×52-[(1+101)+(3+99)+(5+97)+……+(45+57)+(47+55)+(49+53)+51]
=51×52-[102+102+102+……+102+102+102+51](说明:25个102)
=51×52-[102×25+51]
=51×52-[51×2×25+51]
=51×52-(51×50+51)
=51×52-51×51
=51×(52-51)
=51×1
=51
=51×52-[(1+101)+(3+99)+(5+97)+……+(45+57)+(47+55)+(49+53)+51]
=51×52-[102+102+102+……+102+102+102+51](说明:25个102)
=51×52-[102×25+51]
=51×52-[51×2×25+51]
=51×52-(51×50+51)
=51×52-51×51
=51×(52-51)
=51×1
=51
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