解方程组2x-y+2z=6 3x+y-3z=-4 x+y+z=6
人气:399 ℃ 时间:2020-04-02 01:30:27
解答
2x-y+2z=6 (1)
3x+y-3z=-4 (2)
x+y+z=6 (3)
(1)+(2)
5x-z=2 (4)
(1)+(3)
3x+3z=12
x+z=4 (5)
(4)+(5)
6x=6
x=1
z=4-x=3
y=2x+2z-6=2
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