d*d+d+0.5＝0
    lnx-60x=ln0.98
    1/d+1/(d+0.5)＝1/(d+1)
    1/d+1/(1+2d)＝1/(d+1)
    （1+x＾2）＾1/2
    2x²+45=90
    1/d+1/(1+2d)+1/(d+1)＝0
    arc（4/3）
    arc4/3
    arc120
    lnx＝x-1
    （x^2+1）^-1
    1/d+1/(3+d)+1/(d+5)＝0
    1/d+1/(2d+1)＝1/(1+d)
    1/d+1/(2+d)+1/(5+d)=0
    2.625=x*(1-cos(28.65*160/x))
    0.84x^2-12.09x+10.615=0
    -2.2x^2+8x=7.05
    10x+12（28-x）=332
    （800+x-12168.93-0）*（1-25%）+5213.15=5634.18

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