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加減併式與估算

Author:陳嬿羽

牛刀小試

49+52= 85+27= 64+18= 102+29=

三位數的連加併式

三位數的連加併式

三位數的加法與減法

加減兩步驟問題

加減混合併式

加減估算

加減併式與估算

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