a+a÷11.3=545312
    2.7*X^0.89=335.65
    2.60400819053094=（（1+5^x)/2）^(1/x)
    x^3+4x^2+2x+1=0
    x^3+4x^2+2x+1=0
    x-lnx=1.167153
    ex-x=1.167153
    ex-x=x-lnx
    ex-x=x-lnx
    x²-1530x＋260100=0
    8000/（x+101*0.12）+7500/x+8000/（x+101*0.12）=150
    x²-1530x＋260100＝0
    x²-1530x＋780300＝0
    (700x+600)*3*25/1.75＝150000
    1300x*3*25/1.75＝150000
    8000/（x+105*0.12）+7500/x+8000/（x+105*0.12）=150
    （800+X-12168.93-0）*（1-25%）+5213.15=5634.18
    8000/（x+105*0.12）+7500/x+8000/（x+105*0.12）=150
    （800+X-12168.93-0）*（1-0.25）+5213.15=5634.18
    8000/（x+105*0.12）+7500/x+5500/（x+105*0.12）=150

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