20*3.14*0.6（x-20）=（2*3.14*0.147*（560-x））/0.1823
    20*3.14*0.7（x-20）=（2*3.14*0.147*（560-x））/0.3365
    20*3.14*0.5（x-20）=（2*3.14*0.147*（560-x））/0.2231
    20*3.14*0.5（x-20）=（2*3.14*0.147*（560-x））/0.3365
    a^6+152.7887a^3+11a^4+179a^2-2902.986a+119=0
    36x^2-84x+35=0
    （79110-1.1X）*10.8/23.6*0.9=9X
    √5x-√5-5 = -√5/5x+6√5/5
    √5x-√5-5=-√5/5x+6√5/5
    3.5×6+3x=22.5
    3956597.91*(1-2.06%)-(3956597.91/1.09*0.09-171337.87-x/1.03*0.03)*1.12-2075091.99 = x
    13.15×c=（3.3+c）×7.92
    750x=6.667*6836（1189-x）
    820x=6.349*3963（1288-x）
    829x=6.349*3963（1288-x）
    x2-7.3x+10.9=0
    s^3+6s^2+11s+3=0
    （1/0.013）*(（（0.5*x）/（0.5+2*x））^(0.667))*((0.0875)^0.5)*(0.5*x)=50.04
    1/2X-4+X/X-2=1/2
    2251/77500=124200*1.62/310000-0.001*x

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