675乘675-674乘676的简便算法
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![675乘675-674乘676的简便算法](/uploads/image/z/323738-26-8.jpg?t=675%E4%B9%98675-674%E4%B9%98676%E7%9A%84%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95)
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675乘675-674乘676的简便算法
675乘675-674乘676的简便算法
675乘675-674乘676的简便算法
675乘675-674乘676
=675^2-(675-1)*(675+1)
=675^2-(675^2-1)
=675^2-675^2+1
=1
675x675-674x676
=(674+1)x675-674x(675+1)
=674x675+675-674x675-674
=1