（8/27）+1/12
    635-1.96*127/√120
    √13568.64
    √13568.64
    √13568.64
    1614667.79/119
    （426.57-250）²*19+（426.57-350）²*30+（426.57-450）²*42+（426.57-550）²*18+（426.57-650）²*11=
    （1/2022）²+（6*1/2022）+6
    3*（1/2022）²+6*1/2022
    【3*（1/2022）²+6*1/2022】/（1/2022）²+6*1/2022+6
    !(10)
    sin270+cos160
    sin30+cos60
    624-575
    atan0.07
    tan4.04
    tan0.070
    (5^4+64)(13^4+64)(21^4+64)(29^4+64)/(1^4+64)(9^4+64)(17^4+64)(25^4+64)
    [(5^4+64)(13^4+64)(21^4+64)(29^4+64)]/[(1^4+64)(9^4+64)(17^4+64)(25^4+64)]
    (5/14)*(-(2/5)*(log(2,2/5))-(3/5)*(log(2,3/5)))+(4/14)*(-(4/4)*(log(2,4/4))-0)+(5/14)*(-(2/5)*(log(2,2/5))-(3/5)*(log(2,3/5)))

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