1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.71875521879131)
    2000000＝100×80000-20×80000-5×80000-x
    2000000＝100×80000-20×80000-5×50000-x
    6000x－2000x－200x－10000000＝50000000
    X/(1-X)=10%
    x+（（√5-1）/2）x=1
    x×（x+16）
    0.507/(40/Q+8.5)=0.493/(50/Q+6.8)
    0.493/(50/Q+6.8)=0.507/(40/Q+8.5)
    0.493/(50/Q)=0.507/(40/Q)
    1+Q=0
    1-x=2x/√5-1
    (r+17)/(r+59)=23.2/31.6
    （1000000+X）/1.06*0.06*1.12=X
    （1000000+X）/1.06*0.06=1.12X
    x^2=2
    a(-5/6+7/12)+3/2=4/3
    x^2 + 2x + 1 = 0
    x * x + 3 * x - 10 = 0
    0.5x+3.5=3/4x

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