题目

英语翻译
It turns out that information that would be significant for x1 in the first
equation is lost in the truncated arithmetic that says that 1+1/4 ε=1/4.There
is a fix for problems such as this,namely a technique called partial pivoting.
The idea is fairly simple:Do not choose the next available column entry for
a pivot.Rather,search down the column in question for the largest entry (in Pivoting
Strategies absolute value).

提问时间：2020-10-10

答案