13.9307735=(0.0092174253)+(170.61834*x)+(1206.0703*x^1.5)-(4614.6537*x^2.5)+(6556.842*x^3)
    16.1527324=(0.0092174253)+(170.61834*x)+(1206.0703*x^1.5)-(4614.6537*x^2.5)+(6556.842*x^3)
    16.1527324=(0.0092174253)+(170.61834*x)+(1206.0703*x^1.5)-(4614.6537*x^2.5)+(6556.842*x^3)
    17.95828576=(0.0092174253)+(170.61834*x)+(1206.0703*x^1.5)-(4614.6537*x^2.5)+(6556.842*x^3)
    14.88287372=(0.0092174253)+(170.61834*x)+(1206.0703*x^1.5)-(4614.6537*x^2.5)+(6556.842*x^3)
    16.82851019=(0.0092174253)+(170.61834*x)+(1206.0703*x^1.5)-(4614.6537*x^2.5)+(6556.842*x^3)
    （100+x）（1000-2x）=115200
    16.54806707=(0.0092174253)+(170.61834*x)+(1206.0703*x^1.5)-(4614.6537*x^2.5)+(6556.842*x^3)
    27.39317126=(0.0092174253)+(170.61834*x)+(1206.0703*x^1.5)-(4614.6537*x^2.5)+(6556.842*x^3)
    x^2-400x+34800
    x^2-10
    x^2-19
    3x^2+16x+5
    2x^2-2x-1
    60=10/x-10/(x(1+x)^4)+110/((1+x)^5)
    98=10/x-10/(x(1+x)^4)+70/((1+x)^5)
    2x^2-7x+5=0
    98=10/x-10/x(1+x)^4+70/(1+x)^5
    （1-（1/（1+x）^9））/x+11/（（1+x）^10）=9.8
    -10+100x-10(1+x)^10=98x(1+x)^10

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