作业帮2x+3y+z=44 2x+y+2z=38 3x+y+z=33
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2x+3y+z=44 2x+y+2z=38 3x+y+z=33
2x+3y+z=44 2x+y+2z=38 3x+y+z=33
2x+3y+z=44 2x+y+2z=38 3x+y+z=33
2x+3y+z=44 -----1
2x+y+2z=38 ------2
3x+y+z=33---------3
1式-2式2y-z=6 z=2y-6----4
3式-1式x-2y=-11 x=2y-11-----5
将4、5式代入1得
y=8
则
x=5
y=8
z=10
如果是求x,y,z的话，x=5,y=8,z=10
y = 8 x= 5 z = 10
2x +3y +z =44
z=44-2x-3y
2x+y+2(44-2x-3y)=38 ==> -2x -5y=-50
3x+y+(44-2x-3y)=33 ==> x-2y = -11 ==> 2x -4y =-22
"-2x -5y=-50 " + " 2x -4y =-22 " ==> y = 8
x= 5 z = 10
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2x+3y+z=44 2x+y+2z=38 3x+y+z=33