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    90×245.5+60y=34120
    90×245+60y=34120
    90×240+60y=34120
    90×236+60y=34120
    90×235+60y=34120
    90×233+60y=34120
    90×223+60y=34120
    90x+60x=34120
    a=12.7/4[(78-96/2)√(78-96/2)²-8(50/2*3.14)²]
    a=12.7/4[(78-96/2)√(78-96/2)]
    9/20*x+440=x
    8×X=(X+3)×5
    x*450-(70+240*x+171+50+79.24)-(x*450*13/100-x*15-30.4)*12/100=0
    x*x+7.635x+9.78
    x+1.1*x+1.21*x=1986
    (Q×450×13%-Q×15-30.4)×12%=0
    Q×450-(70+240×Q+171+50+79.24)-(Q×450×13%-Q×15-30.4)×12%=0
    x^2+2012*abs(x)-2013=0
    (x+17)^2=2100
    abs(a)=a+1

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