(23.23+53.30)/2*（4.1+5-8.1）
    (-2)^5*1/5+7/20+3^5*9/20
    cosA(6,8)
    asin(sin0.5+cos0.5)
    1/sin0
    1.62e-0.06*400^2+0.0031*400+0.0627
    (1.62e-0.06)*400^2+0.0031*400+0.0627
    (1.62e-0.06)*0.085^2+0.0031*0.085+0.0627
    (1.62e-0.06)*1.853^2+0.0031*1.853+0.0627
    1.62e-0.06*1.853^2+0.0031*1.853+0.0627
    (6+2)/4
    7/8+（1/8+1/9）
    6÷3/8-3/8÷6
    （1258+48）*97/42-e72
    √5+25/5
    √2+25/5
    3^log(3,9)+log(5,1/5)+log(2,1)-lne^2
    log(5,75)-log(5,3)
    lg5+lg20
    log(2,4)十log(4,2)

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