2x^4-2x^3=0
    15.8-x=5.36
    1.042^N=1.2
    17.9-A=(17.9-A)/1.13*0.13+(17.9-A)/1.13*0.13*0.12+17.9*0.0003+A*0.0003+((17.9-A)/1.13-(17.9-A)/1.13*0.13-(17.9-A)/1.13*0.13*0.12-17.9*0.0003-A*0.0003)*0.25
    17.9-A=(17.9-A)/1.13*0.13+(17.9-A)/1.13*0.13*0.12+17.9*0.0003+A*0.0003+((17.9-A)/1.13)*0.25
    17.9-A=(17.9-A)/1.13*0.13+(17.9-A)/1.13*0.13*0.12+17.9*0.0003+A*0.0003+((17.9-A)/1.13-(17.9-A)/1.13*0.13-(17.9-A)/1.13*0.13*0.12-17.9*0.0003-A*0.0003)*0.25
    1/(0.0005585*x+1)=3.1122
    1/(0.0005585*x+1)=3.1122
    log(x)=21.6-7.65*3*x*(x-1)/0.0005585/100/132
    8x^2-27x=486
    -56.9＝-20lgx
    x-1=0.7x
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*5.1)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*5.075)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*5.05)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*5.025)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*5)
    A*A+A=240
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*4.975)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*4.95)

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