1/cosx^2
    X+x/4= 0.77.
    19x-10x=0.81
    4x^2+5 x- 18=0
    1.4x-1.2x=54
    0.2xx=64.8
    √(36-x^2)+√(64-x^2) = 10
    3x²-31x+76=0
    2. 5x-1.25 ^ 2-1.25=0
    5.6x-128.576=x-4.56
    tan(x)=-x
    924*x^3-5779*x^2+1411*x-6=114514
    (x^3-6x^2-2x+12)(231x-1)=114514
    7517.41*1.05^x=10000
    180/x=120/30-x
    x^2+3x+6=114
    √3x一√1
    (0.2-x/0.3)-1=0.1+x/0.2
    200/x=x+200/0.6×4
    -12X^2+6X

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