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    • 算数で考える かんきょう問題(Japanese)
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小数 かけ算・わり算

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日本とアメリカ どっちが水を多く使ってるの？

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日本のCO2の量はへってる、ふえてる？

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節電したら どれくらい電気代を節約できるの？

 

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