3926.59=150*0.45*0.45/0.55/0.55/.55*0.0000184*x/0.0025/0.0025+1.75*0.45/0.55/0.55/0.55*1.185*x*x/0.0025
    6832.27=150*0.45*0.45/0.55/0.55/0.55*0.0000184*x/0.0025/0.0025+1.75/0.45/0.55/0.55/0.55*1.185*x*x/0.0025
    3926.59=150*0.45*0.45/0.55/0.55/0.55*0.0000184*x/0.0025/0.0025+1.75/0.45/0.55/0.55/0.55*1.185*x*x/0.0025
    x^3-x^2-5x+1
    x^3-x^2-5x+1
    x^3-x^2-5x+1
    1/6+4x=6/5
    1383.52=150*0.45*0.45/0.55/0.55/0.55*0.0000184*x/0.0025+1.75*0.45/0.55/0.55/0.55*1.185*x*x/0.0025
    x+3/10=1/5
    499.83=0.45*0.45/0.55/0.55/0.55*0.0000184*x/0.0025/0.0025+1.75*0.45/0.55/0.55/0.55*1.185*x*x/0.0025
    [x^2+16-(16*13)/25]/4x=[x^2+1-13/25]/x
    5773/2.48=150*0.45*0.45*0.00001904*x/0.55/0.55/0.55/0.002/0.002+1.75*0.45*1.185*x*x/0.55/0.55/0.55/0.002
    0.1*21*21+2*21+h=0
    0.969x+0.00013(64.08-x)=26.465
    (20+x)(60-2x)=1050
    0.969x+0.00013(64.08-x)=64.08
    x^0.32=6.6
    x^0.32=17
    1/x=2.035*lg(572871.63*x)-0.91
    1/x=2.035lg（572084.51*x）-0.91

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