5x+4y+z=5 (1)
4x+y-4z=15 (2)
x+y+z=0 (3)
(1)×4+(2)
24x+17y=35 (4)
(1)-(3)
4x+3y=5 (5)
(4)×3-(5)×17
72x-68x=105-85
4x=20
所以x=5
y=(5-4x)/3=-5
z=-x-y=0
三元一次方程5x+4y+z=5、4x+y-4z=15、x+y+z=0怎么解
三元一次方程5x+4y+z=5、4x+y-4z=15、x+y+z=0怎么解
數(shù)學(xué)人氣:903 ℃時(shí)間:2020-06-09 13:07:02
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