解三元一次方程:x+2y+z=4 4x-3z=1 2x+3y+4z=9
今天晚上就要
人气:233 ℃ 时间:2020-02-06 00:46:34
解答
x+2y+z=4 (1)
4x-3z=1 (2)
2x+3y+4z=9 (3)
(3)*2-(1)*3
3x+5z=6 (4)
(2)*5+(4)*3
29x=23
x=23/29
z=21/29
y=36/29
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