20*4+0.5*(-5)*4^2
    20+0.5*(-5)*3^2
    20+0.5*(-5)*4^2
    20+0.5*(-5)*6^2
    20+0.5*(-5)*2^2
    (2√3+2)÷(√3+1-√2)
    （（66150^2）+（34636^2））^0.5
    sin0.2
    sin0.3
    9800*2*（3.141593+6）
    (8/27)^(-1/3)
    (8/27)^(1/3)
    74444-4780-15185*(1+46.6%×3+40%+25%+28.8%+66.2%)
    74444-4780-15185*(1+46.6%×3+40%+25%+28.8%+66.2)
    82283938-2833839+298938-22^2
    2+2=
    199^200
    －arctan0.0000001
    (773/1024)^3+(773/1024)^2-1
    (387/512)^3+(387/512)^2-1

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