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300/x立方+300/x平方+400/x=860
3+3x+4x^2=8.6x^3
3+3x+4x^2=8.6x^3
x>0
x=1, 3+3x+4x^2>8.6x^3
x=2,3+3x+4x^2<8.6x^3
x=1.5,3+3x+4x^2<8.6x^3
x=(1+1.5)/2=1.25,3+3x+4x^2<8.6x^3
x=(1+1.25)/2=1.125,3+3x+4x^2<8.6x^3
x=(1+1.125)/2=1.0625,3+3x+4x^2>8.6x^3
x=1.08,3+3x+4x^2>8.6x^3
x=1.085,3+3x+4x^2<8.6x^3, x=1.085很接近这个方程的解。
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3+3x+4x^2=8.6x^3
3+3x+4x^2=8.6x^3
x>0
x=1, 3+3x+4x^2>8.6x^3
x=2,3+3x+4x^2<8.6x^3
x=1.5,3+3x+4x^2<8.6x^3
x=(1+1.5)/2=1.25,3+3x+4x^2<8.6x^3
x=(1+1.25)/2=1.125,3+3x+4x^2<8.6x^3
x=(1+1.125)/2=1.0625,3+3x+4x^2>8.6x^3
x=1.08,3+3x+4x^2>8.6x^3
x=1.085,3+3x+4x^2<8.6x^3, x=1.085很接近这个方程的解。
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