0.4/100.58＝x/31.88
    （27.776+x）×2.75＝55.552+76.448-x
    （27.776+x）×2.85＝55.552+76.428-x
    0.126864/x＝0.1289/0.86289
    0.4/100.58＝x/31.9
    3*3.14*142*a*（2.3+a）=3.1088*25
    0=1+t-2/t
    0.36*2y
    0.36*2y=
    X/1.01*0.01+（50000-X)/1.13*0.13=4128.44
    X/1.01*0.01+（50000-X)/1.13*0.13=4128.44
    x/0.09+(57803.41-x)/0.13=479138.15
    x/0.09+(8974.37-x)/0.13=74977.74
    x/0.09+(53803.76-x)/0.13=459308.91
    x/0.09+(21.96-x)/0.13=200.54
    x/0.09+（9218.11-x）/0.13=92717.02
    8:5=20:x
    5:20=8:x
    25-x^2=(x-sqrt(9-sqrt(16-x^2))^2
    86/100×x+7=92/100×x+4

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