Question

 Bài 4. Tính bằng cách thuận tiện nhất:

     215 x  12 + 38 x 215                                                   3450 x 15 – 3450 x 5

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Answer 1

215(12 + 38) = 215.50 = 10750

3450(15 - 5) = 3450.10 = 34500

Answer 2

215(12 + 38) = 215.50 = 10750

3450(15 - 5) = 3450.10 = 34500