xxx + 10x + 20 = 0
    (16.40×10^3×44200)/(4880000×5)
    (5.22×10^6)/77460.32
    1667651370=31.25418X+0.0024912X^2
    xxx+10x+20=0
    127.29-20.27x-30.69/(2×1.9) x^2=0
    0.5x^(2)+x=0.156
    0.5x^(2)+x=0.0156
    0.5x^(2)+x=0.016
    0.5x^(2)+x=0.277
    x^3+10*x+20=0
    0.5x^(2)+x=0.208
    1-45.35x=(1+x)^(-60)
    0.5x^(2)+x=0.029
    0.5x^(2)+x=0.023
    x^3-x+0.5=0
    1.0×[（0.785+24×1.5+1.5×1.5）×0.40+0.142]
    e^(9/t)=20
    1.0×{[1.3×（0.785+24×1.5+1.5×1.5）+1.5×0.7×（3+2）]×0.40+1.3×0.142}
    1.0×{[1.3×0.785+1.5×0.7×3.0]×0.4+1.3×0.142}

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