2×63×0.7×(tan(arccos0.85)-tan(arccos0.95))
    2×63×0.7×（tan(arccos0.85)-tan(arccos0.95)）
    2×63×0.7×（tan(arccos0.85)-tan(arccos0.95)）
    50×（tan(arccos0.85)-tan(arccos0.95)）
    30×（tan(arccos0.85)-tan(arccos0.95)）
    -15-45
    -60+76
    -15-45
    (13447.33+13039.92+13172.73+13020.52+13175.72+13405.92+12047.27)÷7
    (13447.33+6305+13039.92+13172.73+13020.52+13175.72+13405.92+12047.27)÷7
    (1450.4+13447.33+6305+13039.92+13172.73+13020.52+13175.72+13405.92+12047.27)÷7
    (1450.4+13447.33+6305+13039.92+13172.73+13020.52+13175.72+13405.92+12047.27)÷7÷30
    13447.33+6305+13039.92+13172.73+13020.52+13175.72+13405.92+12047.27
    1.06^1.5
    9.498e-01
    √（41+2√50）
    380*29 236*56 505*37
    1/√1000
    ［270240*97%/（12000-3000）*10-1］/30.5
    sqrt（9）

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