16×t^2-56t+57=0
    x/（x+15）=0.9
    x/x+15=0.9
    x^2-19X=180
    x^2+19X=180
    2*x^2+13*x+20=0
    x^2+8*x+8=0
    X^4=84X^2+192sqrt3X+576
    X^3-4sqrt3X-36X-48sqrt3=0
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.147)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.416)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.13348820111521)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.40053840514058)
    （x-150）=0.4x
    （x-x/1.13*0.13+0.011）/7.24=0.7828
    （x-x/1.13*0.13+0.011）/7.24=0.3794
    （x-x/1.13*0.13+0.011）/7.24=0.7701
    （x-x/1.13*0.13+0.011）/7.24=0.3258
    （x-x/1.13*0.13+0.011）/7.24=0.5020
    （x-x/1.13*0.13+0.011）/7.24=0.5122

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