1000÷100×（1.7+0.63²×5）
    1.4+0.63²×9.2
    √(〖631.56〗^2+（850.80-602）²)
    40*14
    489.20÷14
    631.56×[（tan（arccos0.64）-tan（arccos0.92）]
    631.56/850.80
    √(〖721.78〗^2+450.45²)
    1662.78*0.7
    1094.43*0.7
    643.5*0.7
    902.23*0.7
    721.78/902.23
    902.23*0.7
    902*0.7
    721/850
    721➗850
    721/850
    √(〖721.78〗^2+850.80²)
    π*1

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