2x+3y+z=11,.①
x+y+z=6,.②
3x-y-z=-2.③
①+③
5x+2y=9.④
②+③
4x=4
x=1
代入④
5+2y=9
y=2
代入②
z=3
x=1,y=2,z=3
2x+3y+z=11,x+y+z=6,3x-y-z=-2求解
2x+3y+z=11,x+y+z=6,3x-y-z=-2求解
数学人气:859 ℃时间:2020-10-01 10:07:18
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