四年级数学下册加法运算定律练习题精选64Word下载.docx
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四年级数学下册加法运算定律练习题精选64Word下载.docx
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700+260=260+____
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160+(840+70)=(160+____)+____
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140+(460+74)=(140+____)+____
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310+(590+65)=(310+____)+____
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39+54+61+46276+699
987+399230+170+830+470
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75+____=16+____
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370+(330+88)=(370+____)+____
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