(1/(x)^0.5)-(1/(1-x)^0.5)+(1/(1+x)^0.5)=0
    8*x^4+x^3-5*x^2-x+1=0
    90=100e1000a
    130[（60+1.5x）(x+40)-2000]=642000
    3x^2 * sin(x)
    x+x÷(1-1/3)=30
    t^2-5t-9/4=0
    2.25=x(x-5)
    tan(0.225*3.1415926)=1.857*1.857/(0.077*2.857*x)+1/（tan(0.0385*x)）+((1/（tan(0.0385*x)）^2+1+(1.857*3.857/(0.077*2.857*x)）^2)^0.5
    4a^2-9a-7=0
    -3.5t^2+3.6t+3.24=0
    x^2-7500x+14035000=0
    -3.5t^3+5.4t^2+9.72t+5.832=0
    0.5t^3+5.4t^2+3.24t+5.83=0
    -0.5t^3+5.4t^2+3.24t+5.83=0
    3x+（2x-4）
    0.71^3+5.4t^2+3.24t+5.83=0
    t^3=5
    x÷560=（x-320）÷640+3
    x÷560=（x-320）÷640+2

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