1/x-100=700-70000x
    arcos0.37383
    45000（1+x）^20=67000
    45000（1+x）*20=67000
    sinx=0.9
    x×9549/603=19
    tan(x)-x=0.0567
    775(1+x)^3 = 560(1+x)^2 + 250(1+x) + 150
    （25-x^2）^2+x^2=25
    1650(1+x)^3 = 890(1+x)^2 + 730(1+x) + 590
    875(1+x)^3 = 330(1+x)^2 + 480(1+x) + 440
    2x^2-12x-9=0
    2x^2-12x-9
    3x/(x^2-9)=5x(x^2+6x+9)+2/(x+3)
    2x^2-12x-9=0
    3x/(x^2-9)=5x(x^2+6x+9)+2/(x+3)
    -e^x+2x+1=0
    e^x+2x+1=0
    800x（tan（arccos0.85）—tan（arccos0.97））
    8x+6=6

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