（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
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=8625642
    A=54120000+A*0.01+A*0.06+0.0072*A
    50 = 0.3333x - 18.883
    50 = 0.3333x - 21.883
    50 = 0.4168x - 23.34
    x*1.71=4.09
    A=54120000+522720+A*0.01+A*0.06+0.0072*A
    14.28X*0.06+14.28X=5096.96
    xtan（0.75x）=2.857142857
    xtan0.5x=2.857142857
    xtan(0.75x)=2.857142857
    16.8X*0.01+16.8X=6434.9
    xtan(0.5x)=2.857142857

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