x-0.03（x-5000）=7000
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*11.84084584)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*11.43950033)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*11.05175842)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*12.25627223)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*12.68627351)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*10.67715903)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*10.31525669)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*9.965)
    100+4x=150+3x
    4800-120*x-2*((80-2*x)*x)=2400
    x^3+4x^2-9x-35＝0
    （60-2*x）*(22-2*x) = 600
    （60-2*x）*(22-2*x)
    （26.326+x）×1.55＝52.652+70.778-x
    （26.326+x）×1.75＝52.652+70.778-x
    （26.326+x）×1.95＝52.652+70.778-x
    （26.326+x）×2.15＝52.652+70.778-x
    （26.326+x）×2.35＝52.652+70.778-x
    （26.326+x）×2.55＝52.652+70.778-x

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