arctan20
    0.63(w-0.07)=1
    0.63x=1
    （2.5x*(5.5+22.09/x)^-2）=1
    X(X+3)(X-3)=575
    s = 0.25 1.5*s^3 - 2.5*s^2 + 1 =
    0.1*（-20）^3-2*（-20）^2+15*（-20）+10
    -4-1
    -5÷5
    8264.360716/12*0.5283
    2X+31.5-3X=30
    （998.5）^1/3
    9^9/9
    （16.5x+x）X2=65
    ch^-1(sqrt((10^4-1)/(10^0.04-1)))/ch^-1(5/2)
    (x-1)^2+3(x-1)
    cos19.948444
    sin(x)=0.989858
    4.868*x+4.541*cos(x)+11.32=0
    sinnnnnnnn=5

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