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easonzk

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[求助] 关于方程数多于未知量的非线性方程组求解

小弟对MATLAB等软件丝毫不懂,请教以下方程组该如何求解?
28.7+3.1300a-257.9900a*exp(-1.8018b)=0
33.6+3.1117a-343.9217a*exp(-2.1584b)=0
38.8+3.1541a-467.8741a*exp(-2.5338b)=0
46.5+3.3300a-645.0000a*exp(-2.9096b)=0

求a和b,如何拟合出最佳解,R平方?
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