0.496/0.9
    746.7:0.9
    664.56:0.89
    664.56:1.11
    3*10^(-6)*(((73.9+32)^2-(3.4+32)^2)/40.4)
    -141.85×2.77×（25-36.4）
    abs(7.38*√((7.38^2+25)*(7.38^2+4)*(7.38^2+156.25))/(300*√(7.38^2+6.25)))
    141.85×2.77×（25-（-4.7））
    （36.89×2.01+17.02×3.77+22.70×2.01+15.60×2.07+7.09×2.07+7.09×2.01+34.76×4.20）÷（36.89+17.02+22.70+15.60+7.09+7.09+34.76）
    0.5*1/3*0.28*18*7.48^3-101.7*(7.48-3)
    0.5*1/3*0.28*18*6.86^3-101.7*(6.86-2)
    0.5*1/3*0.28*18*6.35^3-101.7*(6.35-1)
    0.28*35*(6.6+1.76)+0.5*0.28*18*(6.6+1.76)^2-1/2*5*18*1.76^2
    0.28*35*(6.6+1.91)+0.5*0.28*18*(6.6+1.91)^2-1/2*5*18*1.91^2
    tan(0.034*46.16)
    11/10*sqrt(3)=
    12*25=
    tan0.211
    abs-3+64
    tan0.211

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