中文说明：
用QR法方程组合SVD分解进行最小二乘解方程组，并比较三种方法的稳定性以及准确性。
English Description：
QR method equation combination and SVD decomposition are used to solve the least squares equations, and the stability and accuracy of the three methods are compared
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中文说明：
用QR法方程组合SVD分解进行最小二乘解方程组，并比较三种方法的稳定性以及准确性。
English Description：
QR method equation combination and SVD decomposition are used to solve the least squares equations, and the stability and accuracy of the three methods are compared