tg(arccos0.67)
    tg(arccos0.67)
    x^2/(√3*x+1-√7)^2=x^2+(√3*x+1)^2
     x²+x = 68
     x²+x = 68
    x^2/(√3*x+1-√7)^2=x^2+(√3*x+1)^2
     x²+x = 68
    0.276sinx-x+1.894=0
    sinx+6.491-3.478x=0
    （398*1.2+1200）*20/1.3*1.85x+（398*1.7+1200 ）*2.2*20/1.3*1.85x=450000
    （398*1.7+1200 ）*2.2*20/1.3*1.85*x=450000
    x(x+1)=33550336*2
    x/（30+x）=2/5
    （8-x）^2=x^2+16/9×x^2
    4:6=1.5x：x
    4:6=1.5x：x
    4:6=1.5x：x
    x=15÷（（1+40%）*80%-1）
    x*1.71=3.97
    (210+x)/(257+x)=0.91

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