8:x=16/3
    [（x-8413.15)*0.75]/(30000*0.9)=0.12
    0.038=-0.0002x＾2+0.0491x+0.1224
    0.038=-0.0002x＾2+0.0491x+0.1224
    √(X^2-X-2)+√(2*X^2-X-1)=√(3X^2-2X-3)
    3x^2-10x-4＝0
    2*X^2-X-√(2*X^2-X+3)=3
    √(X^2-1)+√(X^2+4*X+3)=√(3*X^2+4*X+1)
    √(X+1)+√(2X-5)=3
    √(X+1)+√(2X-5)=3
    √(X+1)+√(2X-5)=3
    √(x+1)=0
    X^2-14X-480=0
    4x^2-x+2
    (x+3)+x+2x=19
    75×7.87+12.15x=（75+x）×7.98
    75×7.87+12.15x=（75+75+x）×7.98
    2x+12-x=30
    tan2a＝-1.07
    x*x-600x+53600=0

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