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Minute-second conversion of junior high school mathematics volume I
The normalized component ×60 is differentiated into seconds ×60.

Secondary component ÷60 differentiates into degree ÷60.

The first question is 1, 0.75×60 = 45'. The original question was 15 45'

2, 48 ÷ 60 = 0.8 25.8 ÷ 60 = 0.43 ( 1) = 5 1.43 (2).

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