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
    x÷560=（x-320）÷640+1
    x^3-4x^2-4x+8=0
    50（1-x）²=32
    (5+a)*a=15
    a*3=9
    sqrt(x^2-8√2*x+40)+sqrt(x^2-4√2*x+40)=9
    sqrt(x^2-4x+5)+sqrt(x^2-2x+5)=9

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