arctan(x)+arctan(0.1x)+arctan(0.15x)-arctan(0.75x)=1.57
    11.9*300*35.2=215*x+300*763
    11.9*300*x*(1300-x)-300*763*40=150000000
    100-5*（20-x）=70
    100-（20-x）*1=70
    ln(9-x)
    50-（20-x）*1=70
    x-9x2=30
    90= 100/x^5+7.6/x+7.6/x^2+7.6/x^3+7.6/x^4+7.6/x^5
    sin(x)=x+1
    sin(x)=x+1
    -4/5＝x/√x²+36
    （100+0.8Y）+460
    -4÷5×√x²+36＝x
    -50+0.8y+50+200
    -50+0.8y+50+200
    0.8y-50+50+200
    5.1465=（（0.021*X^1.85+36.6）^0.5）*X^0.84
    x2-70x+1600
    -4/5＝x/√x²+36

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