cosx=54/55
    6x-2（1-x）=6
    54cos20=55cosx
    1/（2+x^2）
    x-sinx-1=0
    inv22
    120cos20=122cosx
    cosx=0.048236
    0.15-2*x/(2303.95*9.80665)*(1-ln(2*x/(2303.95*9.80665*0.15)))-0.0864
    0.15-2*x/(2303.95*9.80665)*(1-ln(2*x/(2303.95*9.80665*0.15)))-0.0865
    0.15-2*x/(2303.95*9.80665)*(1-ln(2*x/(2303.95*9.80665*0.15)))-0.08634
    x/10+(1/15+1/20)*(6-x)=1
    0.15-2*x/(2303.95*9.80665)*(1-ln(2*x/(2303.95*9.80665*0.15)))-0.08628
    2（x+2）=x+2
    (150-10000/x-4)*(16.16+x)=15100
    (150-10000/x)*(16.16+x)=15100
    （2.72+x）/（1+x）=1.2
    （2.72+x）/（1+x）=2
    x^3-11x/4-7/5=0
    （236+5X）÷（51+X）=4.8

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