Предмет: Математика, автор: kravchukmaksim2009

11-11/18x=2 14/15
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Автор ответа: miranadursunova
0

Пошаговое объяснение:

11-11/18x=2 14/15

11/18x= 11-2 14/15

11/18x=10 15/15-2 14/15

11/18х=165/15-14/15

11/18х=151/15

х= 151/15:11/18

х=151/15×18/11 (151 и 11 сокрощаем на 11,а 18 и 15 сокрощаем на 3 )

х=66/5

х=13 1/5

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Efficiency in Engineering Operation

Unlike the scientist, the engineer is not free to solve problems which interest him. He must solve problems as they arise, his solution must satisfy conflicting require¬ments. Efficiency costs money, safety adds complexity, performance increases weight. The engineering solution is the optimum solution, taking into account many factors. It may be the cheapest for a given performance, the most reliable for a given weight, the simplest for a given safe¬ty, or the most efficient for a given cost. Engineering is optimizing.
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The need for efficiency leads to the large, complex operations which are characteristic of engineering. The processing of the new antibiotics in the test-tube stage belongs in the field of biochemistry. But when great quan¬tities must be produced at low cost, it becomes an engi¬neering problem. It is the need for efficiency and economy that differentiates ceramic engineering from the work of the potter, textile engineering from weaving, and agricultural engineering from farming.
Since output is input minus losses, the engineer must keep losses and waste to a minimum. One way is to de¬velop uses for products which otherwise would be waste. Losses due to friction occur in every machine and in every organization. Efficient functioning depends on good design, careful attention to operating difficulties, and lubrication.
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