Câu hỏi :

b) 5 × 2 × 4

* Đáp án

* Hướng dẫn giải

B)

Cách 1: 5 × 2 × 4                                                     cách 2: 5 × 2 × 4

= (5 × 2) × 4                                                            = 5 × (2 × 4)

= 10 × 4                                                                   = 5 × 8

= 40                                                                         = 40

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