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Operating Expenses, Depreciation and Amortization (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Consolidated Operating Expense | Consolidated operating expenses during 2017, 2016 and 2015 by function are as follows:
|  |  |  |  | 2017 |  |  | 2016 |  |  | 2015 |
Administrative expenses1 |  |  | Ps |  |  |  | 21,081 |  |  |  | 20,750 |  |  |  | 18,653 |
Selling expenses |  |  |  |  |  |  | 6,450 |  |  |  | 6,974 |  |  |  | 5,883 |
Distribution and logistics expenses |  |  |  |  |  |  | 28,495 |  |  |  | 26,245 |  |  |  | 23,374 |
|  |  | Ps |  |  |  | 56,026 |  |  |  | 53,969 |  |  |  | 47,910 |
1 | The Technology and Energy departments in CEMEX undertake all significant R&D activities as part of their daily activities. In 2017, 2016 and 2015, total combined expenses of these departments recognized within administrative expenses were Ps754 (US$38), Ps712 (US$38) and Ps660 (US$41), respectively.
Summary of Depreciation and Amortization Recognized | Depreciation and amortization recognized during 2017, 2016 and 2015 are detailed as follows:
|  |  |  |  | 2017 |  |  | 2016 |  |  | 2015 |
Depreciation and amortization expense included in cost of sales |  |  | Ps |  |  |  | 14,146 |  |  |  | 14,180 |  |  |  | 13,154 |
Depreciation and amortization expense included in administrative, selling and distribution and logistics expenses |  |  |  |  |  |  | 1,846 |  |  |  | 1,811 |  |  |  | 1,504 |
|  |  | Ps |  |  |  | 15,992 |  |  |  | 15,991 |  |  |  | 14,658 |

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