4^x=2^(x+2)
    x∧3－120x+200=0
    2x^3+3x^2-25＝0
    2x3+3x2-25＝0
    x∧3-x∧2+9x＝0
    46.2a^2-15.6a+1.1295＝0
    2.6t^2+53t-15=0
    3X^4+4X^3+12X+12=0
    -2x∧3-10x∧2-16x-6＝0
    9*2^0.2*2=x^1.2-2*x^0.2
    ((lnx)^2)/x
     -20 + (-30 / (1 + x%)^1) + (-60 / (1 + x%)^2) + (-25 / (1 + x%)^3) + (-50 / (1 + x%)^4) + (144/ (1 + x%)^5) + (15/ (1 + x%)^5) = 0
    9=(x/2)^0.2*(x/2-1)
    20/x-1=(2/x)^0.2*(2/x-1)
    720（1+a）²等于2205
    100x^2-200x+19=0
    (20-x)/(2-x)=10^0.2
    8.096-x=39.175*0.2*x^0.2
    20-x=39.175*0.2*x^0.2
    20-x=100*0.007*x^(1/1.13)

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