21/x-4＝22/x＋4×1.5
    6/5=15
    0.727x+56.23/1.25-0.272x+5.23/1000=x
    81a^3+108a^2 = 64
    x+x＾2=27÷12
    7/9+3/7
    （k＾2+5）÷(k＾2+1)
    ln3/ln2
    X^6-11/4X^4-1/4X^2=1
    50.24*1.5*1/3*0.85
    50.24*0.85*1/3
    4096/2160
    0.0592*12500X÷（0.0726*（1+12500X））=4200X÷（1+4200X）
    0.0592*12500A÷（0.0726*（1+12500A））=4200A÷（1+4200A）
    786-X/X*100%=67.2%
    4/5×2
    （1350-x）/5×2/3＝（1150-x）/5
    3/5x=60
    15x+100(1-x)=40
    3

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