Đáp án:
A. P = 4000W
Giải thích các bước giải:
Công suất của động cơ thang máy là:\[P = \frac{A}{t} = \frac{{P.h}}{t} = \frac{{20.9m.10h'}}{t} = \frac{{20.9.50.10.4}}{{60+30}} = 4000W\]
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