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    2/√3 ×x^3-3.5×x^2+40/π=0
    2x^3/√3-3.5x^2+40/π=0
    2x^3/√3-3.5x^2+40/π=0
    2x^3-x=14
    2x^3/√3-3.5x^2+40/π=0
    -250x²+650x
    C(2,4)
    C(1,4)
    C(1,5)
    π*(D^2-74^2)=3000000*4*0.042
    π*(250^2-74^2)=X*4*0.042
    π*(D^2-74^2)=3100000*4*0.042
    π*(D^2-74^2)=3000000*4*0.042
    π*(D^2-74^2)=2000000*4*0.042
    (260-x)*(0.75x+45)=9000
    195x+11700-0.75x^2-45x=9000
    (260-x)*(0.75*x+45)=9000
    (260-x)(0.75x+45)=9000
    x^2-120x-2160 = 0
    x^2-120x-2160=0

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