用竖式计算．8.45×3.9（结果保留一位小数）36÷9.9（商用循环小数表示）
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直接写得数．========
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+=+=﹣=+=++=+﹣=﹣﹣=﹣+=
直接写出结果．+=×10%= 3.6÷12= 80%×80%=×4÷×4= 15÷1%=﹣+﹣=
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×10%= 3.6÷12= 80%×80%=
×4÷
×4= 15÷1%=
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