02乘法04一位數二位數乘以二位數(選擇01)
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28 points
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28 points
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29 points
(1). 姐姐的存款全部換成50元硬幣,共可換得214個,姐姐的存款是幾元?
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(2). 39×200□71×100,□中要填入下面哪一個?
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(3). 如果乘數變成100倍,被乘數不變,積會如何?
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(4). 「99×900」是「99×30」的幾倍?
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(5). 在一個整數後面補兩個0,其數值有什麼改變?
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