例假设测出一组(x;y;),已知函数原型为 y(x)=C1+ c2e+ C3 cos(-2x)e. +C4x 用已知数据求出待定系数cz的值 0 0.2 0.4 0.7 0.9 2.882.25761.96831.92582.0862 0.920.99 1.2 1.41.481.5 y;210921979254092.9627315532052例