（X-15926）/X=0.55
    tan（X）=0.701
    1=x x+9=0.1|1
    tan（X）=0.701
    tan（X）=0.701
    1=x
    1+x=0
    x(x-1)*(x+3)+3*(x-1)+11=0
    （1+x^2)^-1
    xtan(x)=2.857142857
    xtanx=2.857142857
    （50/x+6.8）/（40/x+8.5）=0.493/0.507
    100*10%=x*[(1+10%)^3-1]
    2x=10
    (342.6-X)/(X-127.6)*100=2.4
    (342.9-X)/(X-131.9)*100=2.3
    2500/X*0.3=36.8
    x/(1-x)²＝417.4
    -0.4x（X+2）^2+3.6=1.8
    510.5146+x=1282.7-0.1x

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