5x^2+83x-126=0
    36x^2+31x-56=0
    36x^2+31x-5=0
    8x^2-58x+39=0
    60000/a=700
    6x^2+28x-98=0
    112 x^2+85x-143=0
    112 x2 +85x-143=0
    （60-50+x）（800-2x）=12000
    x［1200-5（x-120）］=157500
    f
    （0.021*x^1.85+840）^0.5*x^0.84=1.645
    （0.021*x^1.85+1783）^0.5*x^0.84=1.645
    （0.021*x^1.85+794968）^0.5*x^0.84=1.645
    392×x^2+784x-181 = 0
    2×x^2-51x+315 = 0
    x*e^x=1
    x*e^x=1
    x-x^2=0.04
    x^4+40x^3+400x^2-2000x-20000=0

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