2004*38+2002*62+124 简便算法
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2004*38+2002*62+124 简便算法
2004*38+2002*62+124
=2004*38+2002*62+62*2
=2004*38+(2002+2)*62
=2004*38+2004*62
=2004*(38+62)
=2004*100
=200400
2004*38+2002*62+124
=2004*38+(2004-2)*62+124
=2004*38+2004*62-2*62+124
=2004*(38+62)-124+124
=2004*100
=200400.
把124拆成62*2
原式=2004*(38+62)
2004*38+2002*62+124
=2004*38+(2004-2)*62+124
=2004*38+2004*62-124+124
=2004*(38+62)
=2004*100
=200400