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
    36(1+0.26w×0.26w)=w×w×(1+0.2w×0.2w)×(1+0.05w×0.05w)×(1+0.13w×0.13w)
    0.0178x+1.8x∧0.4＝22.7*13.82
    0.0178x+1.8x∧0.6＝22.7*13.82
    2x²-81x +784 =0
    t^2-t+1=1
    2x+35-x=94
    2x+4(35-x)=94
    100*（1+r）^2 = 100*（1+6%）*（1+7%）
    100*（1+r）^2=100*（1+6%）*（1+7%）

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