a×a+0.7=
    540/x+540/x^2+540/x^3+540/x^4+540/x^5=1390
    4/5(1+X)=8
    -85x^5+54（x^4+x^3+x^2+x)=0
    12=4/5*x+x
    12=1/2*x+x
    0.8=5/10*x+x
    0.11=0.05319+0.05319*x+x
    50/100（1+x）=0.8
    x²-180x+1200=0
    50/100（1+x）=0.8
    50/100（1+x）=0.5
    0.0181x+8.2589=-0.0117x^4+0.1251x^3-0.5931x^2-0.5931x+27.967
    [2(4-2x)^2+4x^2]/32=0.16
    0.0239x+8.2463=-0.0101x*x*x*x+0.1043x*x*x-0.4966x*x-0.6801x+27.986
    e^x=-2x^2-8x
    x+0.05319*(1+x)=0.11
    5s^3-s^2+185s-25
    1/4x∧4-x∧2-x=0
    150=x＾2(0.02x＾2+1)

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