脱式计算 (2+5+8+.+2000)-(1+4+7+.+1999)
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脱式计算 (2+5+8+.+2000)-(1+4+7+.+1999)
脱式计算 (2+5+8+.+2000)-(1+4+7+.+1999)
脱式计算 (2+5+8+.+2000)-(1+4+7+.+1999)
667,其实就是【(2000-2)/3】+1
原式=(2-1)+(5-4)+......+(2000-1999)
=1+1+1+1+......1(共667个)
=667