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    (51000000-120000×x²)×(21000000-100000×x²)-441000000000000= 0
    X/3.7+X/3.8+X/1.68+X/2.9+X/3.15+X/2.14+X/4.2+X/3.95+X/1.57=1
    6.666x=(10000÷0.1111)(x+6.666)^2
    (51-120×x²)×(21-100×x²)-441 = 0
    (51-120×x)×(21-100×x)-441 = 0
    6.666x=(10000/0.1111)(x+6.666)^2
    (35.25-120×x²)×(5.25-100×x²)-27.5625=0
    (35.25-120×x²)×(5.25-100×x²)-25=0
    (51-120×x²)×(21-100×x²)-441=0
    (51-120×x)×(21-100×x)-441=0
    x^2+39.99x-1111=0
    x^2+39.99x-11.11=0
    X/3.7+X/3.8+X/1.68+X/2.9+X/3.15+X/2.14+X/4.2+X/3.95+X/1.57 = 1
    X/3.7+X/3.8+X1.68+X/2.9+X/3.15+X/2.14+X/4.2+X/3.95+X/1.57=1
    √(X^2-X)
    (51-120×x)×(21-100×x)+441=0
    (35.25-120×x)×(5.25-100×x)+27.5625=0
    35.25×5.25-35.25×120×x-5.25×100×x+x²×12000+5.25×5.25=0
    35.25×5.25+35.25×120×x-5.25×100×x+x²×12000+5.25×5.25=0
    x²+1=5

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