sinx=0.086
    x×x-128-16x=0
    0.06cosx+sinx=0.086
    0.06cosx+sinx=0.086
    6762cosx+112700sinx=971.4286
    191+8（129-2x）=985+7（154-8x）
    6762cos(x)+112700sin(x)=971.4286
    xx=1444
    sqrt(x^2+9)+sqrt((12-x)^2+4)=13
    sqrt(x^2+9)+sqrt((12-x)^2+4)=13
    (48-x)=3x
    26.264x - 9.7411=50
    (48-x)÷3=x
    (48-x)÷3=x
    (48-x)/x=3
    2x + 3 = 7x - 1
    60－√3×x=20×√3+3x
    2x + 3 = 7x + 1
    2x + 3 = 7x + 1
    7x = 2x + 4

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