-3k^2+8k+13=0
    -3k+8k+13=0
    -2x^2+5x-2=0
    x²-10x-200＝0
    x²+3x-10＝0
    3x²-42x+288＝0
    0.4*x/3100+0.6*x/1200=5/10^5
    2x-5x²=2
    2x+5x²=2
    8%/X=40/111
    3x²-1=4x
    （40/q+8.5）/（50/q+6.8）=0.507/0.493
    （70+2x）（35+2x）=6000
    x^2+2x-28=0
    18*x*(1+0.15*x^0.687) = 96
    18*x*(1+0.15*x^0.687)=21.25
    0.0016sin(3.14*1.414*12/x)=12*sin(0.0016*3.14*1.414/x)
    0.0016sin(3.14*1.414*12/x)=12*sin(0.0016*3.14*1.414/x)
    0.0016sin(3.14*12/x)-12sin(0.0016*3.14/x)=0
    18*x*(1+0.15*x^0.687)=21.25

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