25x＋（45－x）X15＝975
    0.0075*82*x^(2/3)+164=x
    x/3
    -x^2+2x+3=3
    160y+120(100-y)>=2580
    q^3-10q^2-1200=0
    -x^2+2x+3
    13.8×2200x×(560-x/2)=393.47×10^3×10^3
    -103.845x^4+154.984x^3+106.587x^2-197.698x+78.959=0
    x-2=3x+6
    5x十6x
    1150=0.04*1000*(1-(1/1+x)^6)/x+1000/(1+x)^6
    1150=.04*1000*(1-(1/1+x)^6)/x+1000/(1+x)^6
    95.238*x^2-1070.2*x-3101.9=0
    95.238*x^2+1070.2*x+3101.9=0
    2*x^2-1=0
    95.238*x^2-1070.2*x+3101.9=0
    2.661*(37-x)=(x-15)^0.75
    1（1-x）+x*4=4(1-x)+x*2
    (x-100)/x=0.3

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