0.0522*(a-0.093)/(1+a)=0.0102
    4200/（x+112*0.12）+10000/x+10000/（x+22.4）＝150
    x*x*x-6x*x+12x-6
    8200/（x+112*0.12）+10000/x+10000/（x+22.4）＝150
    log（0.2 ，x）
    x*99.98%-91.202*100.02% = -30/90
    x*99.98%-91.202*100.02%=3/90
    4+x/x=0.77
    1/3（100-x）-1/10x=16
    1/3（100-x）-1/10x=16
    10/25*log10(x/x*1/3)
    x^2+1
    y=0.2*(-5)-4
    9（x-5）÷6=1.5
    79931*x*1000/1.218/(22*5+x) = 38534.04
    79931000x/1.218/(110+x)=37892
    5*x^15+5*x^14+5*x^13+5*x^12+5*x^11-1.75*x^10-1.75*x^9-1.75*x^8-1.75*x^7-1.75*x^6-1.75*x^5-1.75*x^4-1.75*x^3-1.75*x^2-1.75*x=24.2241
    x²－159x+2700＝0
    90-4(x+1)=10
    9(x-5)÷6=1.5

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