Solve 7时10分-6时45分

Evaluate

7 S hi \times 10 F e n - 6 S hi \times 45 F e n

Multiply

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70 e i S h F n - 6 S hi \times 45 F e n

Multiply

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70 e i S h F n - 270 e i S h F n

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

(70 e i - 270 e i) S h F n

Solution

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- 200 e i S h F n

Simplify the expression