（194.3*8.35+559.91*2.6）-204.2*（5.5+5.247-2.2）-522.737*2.1
    （194.3*8.35+559.91*3）-204.2*（5.5+5.247-2.2）-522.737*2.1
    （194.3*8.4+559.91*3）-204.2*（5.5+5.247-2.2）-522.737*2.1
    27.66*5.247+27.06
    66.19+11.83*5.427
    sin(60)
    -0.021*0.73+0.222*0.27
    4^2
    1/0.088231
    25^-2.5
    36^0.5
    1/3501
    3501/1
    3e4+10e2+16e-16e3
    arcsin0.2
    （194.3*2+10*0.1）-204.2*（5.5-2.2-0.5）=
    （194.3*2+10*0.1）-204.2*（5.5-2.2-0.53）=
    （194.3*2+10.01*0.1）-204.2*（5.5-2.2-0.53）=
    （194.3*2+10.01*0.08）-204.2*（5.5-2.2-0.53）=
    （194.3*2.06+10.01*0.08）-204.2*（5.5-2.2-0.53）=

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