Solve 17时45分-14时55分

Evaluate

17 S hi \times 45 F e n - 14 S hi \times 55 F e n

Multiply

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765 e i S h F n - 14 S hi \times 55 F e n

Multiply

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765 e i S h F n - 770 e i S h F n

Collect like terms by calculating the sum or difference of their coefficients

(765 e i - 770 e i) S h F n

Solution

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- 5 e i S h F n

Simplify the expression