x*sqrt(1+0.25x^2)20
    S×S×S＋4S×S＋S-6＝0
    (160+y)*(200-y)=41600
    x*sqrt(2500+x^2)=1000
    x（2x-4）=5-8x
    （1+2y）（ 1-2y）
    0.25(1000+x)=0.212×1000+1.121x
    10sqrt(1+(0.1x)^2)/(x*sqrt(1+x^2))=1
    x*13+（320-x）*3%=320*9%
    lnx=(x-1)*ln5/4
    （26.253+x）×0.85＝52.306+67.359-x
    （26.253+x）×0.85＝52.306+68.359-x
    （26.253+x）×0.85＝52.306+69.359-x
    （26.253+x）×0.85＝52.306+70.359-x
    （26.253+x）×0.85＝52.306+71.359-x
    （26.253+x）×0.85＝52.306+72.359-x
    x÷0.91*1.23*0.9=51.99
    x÷0.91*1.23*0.9=60.99
    x÷0.91*1.23*0.9=61.59
    x÷0.91*1.23*0.9=90.25

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