data = {{0, 6.39}, {49, 9.48}, {98, 12.46}, {147, 14.33}, {294,
21.94}, {391, 22.64}, {489, 21.34}, {587, 22.07}, {685, 24.53}};
FindFit[data, m - (m - 6.39)*Exp[-k x], {m, k}, x]
{m -> 18.5988, k -> 7.52614*10^19}
数据有问题。。。不过拟合就是这么做的。
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