（10+x）（500-10x） = 8000
    -2x^2+y=0 -x^3+x=0
    y=11.589*370-794.6
    （10-x）（500-10x）=8000
    x×4.75%×5＋x＝49500
    387.31135+2.57247*X=389.10042+1.88001*X
    754.01x^0.4+3.125x=10000
    12.3-s/4.5=2
    4(h-0.5)=7 17.7=6V-2.6 18=n/4+2
    x^(2)+11x+28=70
    x^(2)+2x+7=70
    n(n+2)=1.3
    2^(-0.0169/x)=0.4
    n(n+2)=1.342
    712.2x^0.4+3.125x=10000
    B×70%=84
    1/d+2/(d+1)=0
    H×30%=9
    90-arctan0.2x=60
    7/5x+3/4x1/2=3/4

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