-21-18-15
    9-24
    -21-18
    3-24
    √-8
    √（√3*3√3）
    √√3*3√3
    √3*3√3
    1-16
    -32+64-128+256
     -10+12-14+16
    arctan1
    arctan(-1)
    3.33/(2.26*10^-6)
    √880
    3.33/2*10^-6
    25/(8.314^2*160000)
    e^0.00076
    e^7.6*10^-4
    （1*2）^2

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