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3x+2y+z=6(1)z+y-x=1(2)5x+y-3z=3(3)
题目详情
3x+2y+z=6(1) z+y-x=1(2) 5x+y-3z=3(3)
▼优质解答
答案和解析
(1)-(2)
4x+y=5 (4)
(1)×3+(3)
14x+7y=21
2x+y=3 (5)
(4)-(5)
2x=2
x=1
y=3-2x=1
z=6-3x-2y=1
4x+y=5 (4)
(1)×3+(3)
14x+7y=21
2x+y=3 (5)
(4)-(5)
2x=2
x=1
y=3-2x=1
z=6-3x-2y=1
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