!(1.1)
     (80 / 1.1157) + (80 / 1.1157^2) + ... + (80 + 1000) / 1.1157^23
     30.50 * (1 - (1 + 0.0339)^(-27)) / 0.0339 + 1000 / (1 + 0.0339)^27
    (39.30 / 0.2351) * ((1 - (1 / (1 + 0.2351)^26)) / 0.2351)+1,000 / (1 + 0.2351)^26
    (39.30 / 0.2351) * ((1 - (1 / (1 + 0.2351)^26)) / 0.2351)
    10.42^2
    （√3+1）/2
    √3+1/2
    (8)^(1/3)
    8^(1/3)
    8^(1/3)
    cos(3.1415926)
    cos(90)
    cos0.5
    999899990001*891
    (1+sin(32))/(1-sin(32))
    -90 - arctan(0.1*2) - arctan(0.2*2)
    90 - arctan(0.1*4) - arctan(0.2*4)
    90 - arctan(0.1*2) - arctan(0.2*2)
    -10lg(1-0.004)=

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