0.3×3x+0.5x+0.6×（100-4x）=45
    16x^5-8x^3+x-4=0
    40%x/x-0.5=60%
    40%x/x-0.5=60%
    40%x/x-0.5=60%
    40%x/x-0.5=60%
    x-1/x
    125+X*25%=80+X
    a^2+(14-a)^2=100
    4＝596500x
    40000000000000000000＝5965000000000000000000000x
    2500x^2+2500x+500＝3140
    2500x^2+2500x+500
    x+2.4x=5.1
    2（x+19.2+5）=50+222-2x
    2^m+2^（m+2）＝8
    x*(1+x)^60/((1+x)^60-1)=1113.89/60000
    x^2+10x+2=0
    x^2+10x+2=0
    ex＝1／x＋1

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