（20+19.4×3.26）×0.704-2×0.839×8
    (20 + 19.4 * 1.8)*0.704 - 2*0.839*8
    1137.980085+4.9+15
    1/128(10*(-224/15)+(64-25.6*(-224/15))/13.8)
    (tan(40))^2
    (tan(45-6.2/2))
    (tan(45-10/2))^2
    3927/(800×1200)
    2232234244553*2382231255203103
    0.45×1.43/300
    (1088.29×10^6+0.2×1.0×14.3×800×1165×(0.1×1165-35))/(300×(1200-35))
    1088.29/(300×(1200-35))
    log(2.72,3.6)
    log(2.27,3.6)
    0.107×207.57×7^2
    lg12.096
    10^-3.69579113035815
    5169*0.8
    10/1.1111+10/(1.0771)^2+110/(1.0746)^3
    171.000281/3351.03

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