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    (1+k^2-2k)×(9.9/5.1)^2=(1-k)^2
    x^2+1=3
    -78+80.4/(1+X/12*2)+3.6/(1+X/12*24)=0
    -78+84/(1+X/12*2)=0
    30x+50(100-x)=3500
    x=((1+20%)-(1-20%))÷(1-20%)
    x^2+5x-2250
    x+4=0
    【16*(2^1/2)-7】x^2+【24*(2^1/2)-7】x+9*(2^1/2)=0
    (4x+30)/2-2=(45-100x)/30
    3x^2+24x+20=0
    84/(1+X/12*2)=78
    92x+80×(72-x)=85×72
    x^2-1130x+512000000=0
    x/0.03-x=14800
    29.5-20lg(w)-10lg(1+w*w/64)-10lg(1+w*w/10000)=0
    x^9+((-2)-2-2*2-17)*x^8+(16*2+16*2+32*2+119)*x^7+((-104*2)-105*2-208*2-442)*x^6+(352*2+363*2+702*2+937)*x^5+((-662*2)-706*2-1302*2-1140)*x^4+(688*2+764*2+1290*2+769)*x^3+((-377*2)-427*2-614*2-269)*x^2+(100*2+104*2+116*2+42)*x-10*2-6*2-6*2-2=0
    x^9+((-1)-1-2*1-17)*x^8+(16*1+16*1+32*1+119)*x^7+((-104*1)-105*1-208*1-442)*x^6+(352*1+363*1+702*1+937)*x^5+((-662*1)-706*1-1302*1-1140)*x^4+(688*1+764*1+1290*1+769)*x^3+((-377*1)-427*1-614*1-269)*x^2+(100*1+104*1+116*1+42)*x-10*1-6*1-6*1-2=0
    12x+6=150
    (0.1+2x)x÷(0.1-2x)=1.76÷100000

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