S=1.04²{1.04−1/1.048−1}1.048*28600
    S=1.04²[1.04−1/1.048−1]1.048*28600
    S=1.04²（1.04−1/1.048−1)1.048*28600
    e^(-x^2)=x^x-1
    (x+5)/(x-5)= -(3/2)
    x/1-x
    2-2x=(π-2)√1-x^2
    2-2x=(π-2)x
    2-2sinx=(π-2)sinx
    X/1.09*0.09-X/1.03*0.03=38367.63
    X/1.09*0.09-X/1.03*0.03=233204.97
    X/1.09*0.09-X/1.03*0.03=7467.51
    X/1.13*0.13-X/1.09*0.09=48775.78
    （4173442.74-x-2000000）*0.15+450000=x
    4173442.74-x-3961144.26-x=（4173442.74-x-2000000）*0.15+450000
    （3578-X）*0.006=3487.53
    x-0.75＝（-0.98x^2+0.46x+0.77）*0.765
    tan(0.05x)+x=0
    tan(0.8x)+x=0
    tan0.05x+x=0

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