400x=1040-320
    64x^5-6.4x^4+（10^-18）x-2.5*（2.5*10^-19）
    3.83*(x+0.41)*0.897*5.25=x*5.8*1*3.4
    3.83*(x+0.41)*0.897*5.25=x*5.8*1*2*3.4
    (x+0.46)*5.25*0.897*2.41=x*5.8*1*2
    (x+0.46)*5.25*0.897*2.41
    (x+0.73)*5.25=x*5.8
    (x+0.73)*5.25*0.897=x*5.8*1
    x^2+(900/x^2)-144=0
    x^2+(900/x^2)+144
    x^2+900/x^=144
    （100+x）:100:（100-20）
     x^8 = 4^x
    x/1.1+5=x
    x/1+9=x
    x÷(x+773)=0.64
    h=[3.932×(4+2.877h)^(2/3)]^(3/5)/(4+1.304h）
    14²=(11√2-a)²+(11√2-2a-√3a)²
    x/4+9=x
    x/3+9 -10x5*2

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