2+4/7
    arcsin0.29465
    2^7
    √e^ln2
    √e^ln2
    e^ln2/2
    e^1/2（1+ln2）
    1/4ln8-3/4ln2
    377/(0.85×0.85)×0.8
    874.5/(0.85×0.85)×0.8
    925.2/(0.85×0.85)×0.8
    456.9/(0.85×0.85)×0.8
    320.9/(0.85×0.85)
    456.9/(0.85×0.85)×0.8
    456.9/(0.85×0.85)×0.8
    551.4/(0.85×0.85)×0.8
    1814.9/(0.85×0.85)×0.8
    150÷90
    150÷9
    arccos2

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