(0.6x)^2+(0.8x+sqrt(x^2-16x+80))^2=(4sqrt(5))^2
    (4-0.8x)^2+(3-0.6x+5)^2=x^2-16x+80
    (4-0.8x)^2+(3-0.6x+5)=x^2-16x+80
    -432= (2x-3)^3*(x+2)^4
    48=(2x-3)^3*(x+2)^4
     x+4.5=0.67×x
    x^3-0.1x^2+0.023x-0.011425=0
    x^3-0.09984*x^2+0.023*x-0.011425=0
    0.1×x=6
    44-x=34.9
    13x^2-78x+169
    2.8X-X=28.8
    0.2X+(X+0.2X)=680000
    X*0.2+(X+X*0.2)=680000
    (X*0.2)+(X+0.2X)*0.2=68
    s^3+9s^2+20s+10=0
    （3÷4）x+（x-8）＝13
    （3÷4）x+（x-8）
    0.137=（0.0772-4.14）/（1+（X/945)^1.02)+4.14
    1.808=（0.0832-3.13）/（1+（X/788)^1.13)+3.13

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