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题型:单选题 题类: 难易度:普通
贵州省铜仁市德江县2022-2023学年五年级下学期数学期中试卷
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+ = 160+230= 400×8= 503×7≈
﹣ = 1﹣ = 282+306≈ 396×9≈
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