问题标题:
用列主元消元法解方程组—X1+2X2=2;—X1+3X3=1;2X1-X2-X3=1
问题描述:
用列主元消元法解方程组—X1+2X2=2;—X1+3X3=1;2X1-X2-X3=1
花伟回答:
一2X1-X2-X3=1二2X1-X2-X3=1三2X1-X2-X3=1
-X1+3X3=1-0.5X2+2.5X3=1.51.5X2-0.5X3=2.5
-X1+2X2=21.5X2-0.5X3=2.52.3X3=2.3
用回代过程解方程组三得X1=2X2=2X3=1
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