Đặt tính rồi tính: a) 438 906 + 45 029 ………………………………………………………… ………………………………………………………… ………………………………………………………… ………………………………………………………… …………………………………………………………. …………………………………………………………. ……

   a)   438 906 + 45 029

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   b)   428 × 306

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