01乘法和除法
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(1)  14000×15000的積有幾個零?
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(2)  32000÷9000 的商和餘數各是多少?
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(3)  計算450000 ÷ 7000時,可先刪去被除數和除數相同個數的幾個0再計算,所得的商不變?
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