1/(d＋9.62)＝1/d＋1/(d＋5)＋1/(d＋20)＋1/(d＋7.70)
    1/d+1/(d+5)+1/(d+7.14)+1/(d+20)=1/(d+3.85)
    (d+3.85)*(d+5)*(d+7.143)*(d+20)+d*(d+3.85)*(d+7.143)*(d+20)+d*(d+5)*(d+3.85)*(d+7.143)=d*(d+5)*(d+7.143)*(d+20)
    (d+3.85)*(d+5)*(d+7.14)*(d+20)+d*(d+3.85)*(d+7.14)*(d+20)+d*(d+5)*(d+3.85)*(d+7.14)=d*(d+5)*(d+7.14)*(d+20)
    1/d+1/(d+5)+1/(d+20)+1/(d+7.69)=1/(d+3.92)
    xXsqrt（1+0.04x）Xsqrt（1+0.0025XxXx）=8.696
    lgx=-0.161
    1/d＋1/(d＋5)＋1/(d＋20)＝0
    x^3+5.8x^2+4.3x+1.6=0
    1/d+1/(d+5)+1/(d+20)=0
    w*w(1+0.04w*w)(1+0.0025w*w)=0.49
    1.5X=3.5
    6a+24=60
    12+2b=30
    x+5=9
    1.2(4+x)=3.6(x-14)
    3(3y-1)-12=2(5y-7)
    arctan(0.26w)-arctan(0.2w)－arctan(0.05w)－arctan(0.13w)＝-90
    arctan0.26w－90-arctan0.2w－arctan0.05w－arctan0.13w＝-180
    0.0189x+1.8x∧0.4＝22.7*13.82

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