2/3*((1-1/0.06)+(3/4+1/0.06)*(1/3*213.8256/x*0.35805183739485175)^0.06)=6.549/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*213.8256/x*0.35805183739485175)^0.055)=6.549/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*213.8256/x*0.35805183739485175)^0.05)=6.549/x
    2/3*((1-1/0.03)+(3/4+1/0.03)*(1/3*213.8256/x*0.35805183739485175)^0.03)=6.549/x
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.4559)
    2/3*((1-1/0.01)+(3/4+1/0.01)*(1/3*213.8256/x*0.35805183739485175)^0.01)=6.549/x
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.37355)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.47971)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.442428)
    (2-X)(20+40X)=60
    7.372987988*（1-x）=5.622893082
    0.131/x＝0.1289/0.86289
    0.4/100.58＝x/32.95
    （26.274+x）×2.75＝52.549+70.873-x
    2.23/（x+1）=2.16
    x^2+5x+5=0
    x^2-8.7x+17.8=0
    60=X^2
    60=4X
    9^x-7^x=32

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