25233（7-x）=74767(x-4)
    x=4.176*2.044/0.125/2.132
    0.5*x^11-x+0.5=0
    4.176=0.125*4.146*x/（0.125x+4.176）-2.044
    180-arctan(x)-arctan(x/1.25)-arctan(x/5)=30
    r*3=6
    x^3-x^2-4*x-2=0
    x/(400+x)=0.15
    xxxxx+x-1
    -3x^2=-588
    -x^2=-588
    xxx+2xx+10x-20
    c+25=40
    sin(x)=1000/1815
    10lg(103.72+102.67)-10lg2
    y*2=16
    3x^(2)-2x-2＝0
    10lg(10^6.02+10^5.51)-10lg2
    6（πx^(2)×2x）＝710
    4（πx^(2)×2x）＝710

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