三年级数学下册2《除数是一位数的除法》笔算除法(商不变的规律)练习新人教版.doc

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1(商不变的规律)一、估算下面各题6127 4893 79658923 8174 319686052 37164 2730940255 62877 30956二、先把估商写在上面的括号里,再算出准确的商三、下面各题,先求准确的商,再估算四、用估算检查下面的计算结果,看商的最高位有没有错误2146728584 235605712估算: 估算:329978999 463427906五、小华 8 天看完一本 389 页的故事书,他每天大约看多少页?参考答案一、4200,1500,4000,300,200,400,300,900,300,800,900,500,3二、(900)912,(700)728,(1400)13832三、901(900),698(700)四、略五、50 页

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