(1+x)^-1=1
    （1+x）=1
    0.05*(8.333/(0.6+H))^2-H+0.754=0
    100×（1+x）+100×（1+x）^(2)＝364
    x^3+3x^2-24x+28=0
    0.07*(8.333/(0.65+H))^2-H+0.61=0
    -3x>5
    x>－5╱3
    (8.333/(0.65+H))^2-10*H-17.6=0
    12x+8(15-x)=152
    ((1+x)^20*x)/((1+x)^20-1) = 0.1313
    e^(-x)=lnx
    10^x=5x
    x^2+147x+75*72-210/0.005=0
    ((1+x)^20-1)/x/(1+x)^20 = 7.5
    0.05*(8.333/(0.65+H))^2-H-0.45=0
    0.07*(8.333/(0.65+H))^2-H-0.95=0
    x/(x+1000)
    0=(2*3.14*10*x-1/(2*3.14*x*0.01))
    1/(x+2)+1/(x+5)=1/x

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