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2018-10-01 · 中小学教师,杨建朝,蒲城县教研室蒲城县教育学会、教育领域创作...
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原方程变为ln(0.4/x)+ln{[5(1-x)/3]^2.47}=0.598*1.47=0.87906,
0.4/x*[5(1-x)/3]^2.47=2.408634526,
[5(1-x)/3]^2.47=6.0215851315x,
左减,右增,有唯一解。
设f(x)=[5(1-x)/3]^2.47-6.021586315x,
f(0.3)=-0.343,
f(0.2)=0.830,
f(0.27)=-0.00262,
f(0.269)=0.00889,
f(0.2698)=-0.000318,
f(0.2697)=0.000833,
所以x≈0.2698.
0.4/x*[5(1-x)/3]^2.47=2.408634526,
[5(1-x)/3]^2.47=6.0215851315x,
左减,右增,有唯一解。
设f(x)=[5(1-x)/3]^2.47-6.021586315x,
f(0.3)=-0.343,
f(0.2)=0.830,
f(0.27)=-0.00262,
f(0.269)=0.00889,
f(0.2698)=-0.000318,
f(0.2697)=0.000833,
所以x≈0.2698.
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