27*21-（27-18x）（21-14x）=119
    27*21-（27-18x）（21-4x）=119
    x-x×sqrt(1-122449/x²) = 158.1
    x-sqrt(1-122449/x²)＝158.1
    0.000001*x^4-0.00003*x^3+0.0002*x^2+0.0029x+1.3327=1.3586
    0.000001*x^4-0.00003*x^3+0.0002*x^2+0.0029x+1.3327=1.3569
    0.000001*x^4-0.00003*x^3+0.0002*x^2+0.0029x+1.3327=1.3540
    0.000001*x^4-0.00003*x^3+0.0002*x^2+0.0029x+1.3327=1.3514
    0.000001*x^4-0.00003*x^3+0.0002*x^2+0.0029x+1.3327=1.3482
    0.000001*x^4-0.00003*x^3+0.0002*x^2+0.0029x+1.3327=1.3451
    0.000001*x^4-0.00003*x^3+0.0002*x^2+0.0029x+1.3327=1.3403
    0.000001*x^4-0.00003*x^3+0.0002*x^2+0.0029x+1.3327=1.3386
    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

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