821+822+823+825+826+827=________×________=________.
网友回答
824 6 4944
解析分析:821=824-3,822=824-2,823=824-1,825=824+1,826=824+2,827=824+3;由此把所有的加数变成含有824的算式,再运用加法结合律简算,然后根据乘法的意义求解.
解答:821+822+823+825+826+827,
=(824-3)+(824-2)+(824-1)+(824+1)+(824+2)+(824+3),
=(824+824+824+824+824+824)+(3+2+1-1-2-3),
=824+824+824+824+824+824,
=824×6,
=4944.
故