2.275=x/(955.1-613.8)
    x^2+(x+√3x)^2=(√6+√2)^2
    2.266=1112.3/(1118.3-x)
    2.266=990.5/(x-625.5)
    4X+4X-6=50
    1700+50x
    （6-x）（400×1.25+40x）=1920
    （6-x）（400×1.25+40x）
    （14-8-x）（400-40x）=1920
    t*(8-2t)/2＝2
    t(4-t)=2
    90x+80(100-x)=8350
    x*0.1+(x+(x*0.1))*0.09+(x*0.1+(x+(x*0.1))*0.09)*0.09=498.96
    x*0.1+(x+(x*0.1))*0.09+(x*0.1+(x+(x*0.1))*0.09)*0.09
    t(4-t)
    2t-t*t＝1
    t=1/(2-t)
    x/2-(2-x)=1
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.123295)
    ln（x-1）

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