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Đặt tính rồi tính:     24 × 2                                          31 × 3                                          22 × 3           ……………                               ……………                                ……………           ……………                               ……………                                ……………           ……………                               ……………                                ……………                                              43 × 2                                        12 × 4                                          ……………                               ……………                                          ……………                               ……………                                          ……………                               ……………