（38.584+x）×2.65＝38.584-x+68.468
    （38.584+x）×2.8＝38.584-x+68.968
    （38.584+x）×2.65＝38.584-x+68.968
    （38.584-x）×2.65＝38.584-x+68.968
    （38.584+x）×2.5＝38.584-x+68.968
    （38.584+x）×2.35＝38.584-x+68.968
    (2x/(2x-5))-(2/(2x+5))=1
    (2x/2x-5)-(2/2x+5)=1
    -x^2/x+1=0
    -x^2-x-1=0
    x＋(x×0.468)=3.13
    x*0.7=48
    x*0.7=49
    100x=540+(20+5)x
    (x*2*0.75)/2=33
    (101325-10^(6.031-1211/(x+220.8))/(10^(6.031-1211/(x+220.8))-10^(6.080-1345/(x+219.5)))=0.5
    -x^3+12x^2-21x+10=0
    ( X+50% x)×90%-50- X=1000
    0.8x+arctanx=180
    0.1x+arctanx=180

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