4.8×2.95＋3.6÷0.24-2.5
    10-(3.6÷5＋3.2)×0.2
    [6.3＋(2.7×3.8-5.76]÷3.6
    69.3×(9.2÷6.93)
    X-10=4(X-22)
    15600*x=1885
    10880*x=1885
    12880*x=1885
    10451*x=1885
    -x^2-(6x-2(2x+x^2))
    0.85*42X+0.15*15X=18380*0.53
    0.85*42X+0.15*15X = 13680*0.53
    0.85*42X+0.15*15X=17620*0.53
    log（3,5）
    （2y－4）^(2)
    422834072868/2198243423727
    0.2*1.0948+0.4*0.92+0.95*0.4
    0.2*1.0948+0.4*0.92+0.95*40
    1234*123612361236-1235*123412341234
    1927*x=680

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