196+197+198+199这道题要怎样用简便方法计算?

日期:2009-03-15 11:12:55 人气:3

196+197+198+199这道题要怎样用简便方法计算?

196+197+198+199 =200*4-4-3-2-1 =800-10 =790
    A+
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