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huongb8910
2 năm trước
Câu 1, Đặt tính. `9240 ÷ 246` `7895 ÷ 83` `9785 ÷ 79` Câu 2, Tính nhanh. `27 × 39 + 27 × 63 - 27 × 2` Câu 3, Tính nhanh `1 + 1 × 1 + 20 - 15 × 10`
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