x-sqrt(x²-123287.7)＝158.1
    -0.00000002*x^6+0.0000009*x^5-0.00002*x^4+0.0001*x^3-0.0003*x^2+0.0036*x+1.3325=1.3514
    -0.00000002*x^6+0.0000009*x^5-0.00002*x^4+0.0001*x^3-0.0003*x^2+0.0036*x+1.3325=1.3482
    -0.00000002*x^6+0.0000009*x^5-0.00002*x^4+0.0001*x^3-0.0003*x^2+0.0036*x+1.3325=1.3451
    -0.00000002*x^6+0.0000009*x^5-0.00002*x^4+0.0001*x^3-0.0003*x^2+0.0036*x+1.3325=1.3386
    -0.00000002*x^6+0.0000009*x^5-0.00002*x^4+0.0001*x^3-0.0003*x^2+0.0036*x+1.3325=1.3403
    -0.00000002*x^6+0.0000009*x^5-0.00002*x^4+0.0001*x^3-0.0003*x^2+0.0036*x+1.3325=1.3386
    -0.00000002*x^6+0.0000009*x^5-0.00002*x^4+0.0001*x^3-0.0003*x^2+0.0036*x+1.3325=1.3586
    -2^(-8)*x^6+9^(-7)*x^5+-2^(-5)*x^4+0.0001x^3-0.0003x^2+0.0036x+1.3325=1.3586
    (-2)^(-8)*x^6+9^(-7)*x^5+(-2)^(-5)*x^4+0.0001x^3-0.0003x^2+0.0036x+1.3325=1.3586
    1.3586=-2E-08x^6+9E-07x^5-2E-05x^4+0.0001x^3-0.0003x^2+0.0036x+1.3325
    1.3403=-2E-08x^6+9E-07x^5-2E-05x^4+0.0001x^3-0.0003x^2+0.0036x+1.3325
    1.3386=-2E-08x^6+9E-07x^5-2E-05x^4+0.0001x^3-0.0003x^2+0.0036x+1.3325
    19.6x^3+248.43x^2-1990.79=0
    2(1-x)(1-x)(1-x)=x(2-x)(3x-1-x2)
    2(1-x)(1-x)(1-x)=x(2-x)(3x-1-x×x)
    【（260+260+220）*81-x】*0.85+（32+32+8）*（63+18）=49860
    (124+282)/31*x+265/31*(x+15)+106.5/31(x+30)=1208
    (187+313)/31*x+234/31*(x+15)+106.5/31(x+30)=1208
    (x/(2-x))/(1-x)/(1-x)*(2-x)*(2-x)=0.99

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