（5/6）^7
    50*105.02/192.6
    sin(46)*146
    37086.40816^(1/2)
    60^2+146^2-2*60*146*cos(134)
    175*sin(55)/sin(79)
    175*sin（55）/sin(79)
    2.25^4-4*2.25^2+3
    e^(3)/5+3
    [200-200*cos(0.4*π)]^(1/2)
    200-200*cos(0.4π)
    200-200*0.4*π
    0.225*27-2.7*3
    0.225*9-2.7*3
    0.225*（-8）+5.4
    0.225*8-5.4
    50/(e^3)
    (6*2.29*2.29-4)/(e^2.29)
    (6*2.29*2.29-4)/(e2.29)
    -8/64+2/8+2.1

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