142.86=0.92*x*(2*9.8*(59.3-x))^0.5
    V1=22260/(6.0%-2.75%)×(1-((1+2.75%)^8/(1+6.0%)^8))
    111.55=0.92*x*(2*9.8*(56.02-x))^0.5
    115.68=0.9211*x*(54.52-x)^0.5
    111.55=0.92*x*(56.02-x)^0.5
    tanx=(x^2+0.00074x)/(0.037x^2+0.13x+0.00074)
    tanx=(x^2+0.00074x)/(0.037x^2+0.13x+0.00074)
    tanx=(x^2+0.00074x)/(0.037x^2+0.13x+0.00074)
    tanx=(x^2+0.00074x)/(0.037x^2+0.13x+0.00074)
    tanx=(x^2+0.00074x)/(0.037x^2+0.13x+0.00074)
    111.547619=0.916002744*x(56.02-x)^0.5
    tanx=(x+0.00074)/(0.13074+0.037x)
    x=14.58*14.58/2/9.81
    x^2/2/9.81+9370^2/2/9.81/81/81/14.214/14.214=14.214
    （9370/81/x）^2/2/9.81+x=14.21
    9370/81/x+x=14.21
    0.7x=28000
    0.132579699^2=2/x-(2/x^2)(1-e^(-x))
    2.114918934^2=2/x-(2/x^2)(1-e^(-x))
    10000/x+18000/(x+60)=150

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