(25.343+x)×2.55＝50.687+69.33-x
    X/135-10/125-(100-X)/340=0.238
    X/135-5/125-(100-X)/340=0.238
    0.1261/x＝0.1289/0.86289
    0.4/100.58＝x/31.7
    （25.343+x）×2.65＝50.687+69.33-x
    (x-1)-(1-x)+(x+1)=
    （480*81-x）*0.85+(18+18)*81=32884
    （480*81-x）*0.85+(18+18)*81=2884
    X*3%=34200.28
    1.6x+1.6x*6%=80
    x^2-81/22x+1/99=0
    A×6×0.5×3A×0.5=9
    4x^3+15x^2+16x+6=0
    2t^2+30t=300
    2t^2+30t=300
    12.07c=（3.5+c）×7.92
    12.07c=（3.4+c）×7.92
    c(6,3)
    c(8,3)

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