0.4x+0.3y-0.2z=4
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0.4x+0.3y-0.2z=4
0.6x-0.5y+0.3z=5
0.3x+0.2y+0.5z=22
0.6x-0.5y+0.3z=5
0.3x+0.2y+0.5z=22
![0.4x+0.3y-0.2z=4](/uploads/image/z/19034256-48-6.jpg?t=0.4x%2B0.3y-0.2z%3D4)
0.4x+0.3y-0.2z=4①
0.6x-0.5y+0.3z=5 ②
0.3x+0.2y+0.5z=22 ③
②-2·③=-0.9y-0.7z=-39→0.9y+0.7z=39→y=(390-7z)/9④
3·①-2·②=1.3y-0.8z=2→y=(20+8z)/13⑤
将④代入⑤,得:z=30,再将z=30代入①中得:y=20,再将z=30,y=20代入①中得:x=10,
所以该方程组的解集为:
x=10
y=20
z=30
0.6x-0.5y+0.3z=5 ②
0.3x+0.2y+0.5z=22 ③
②-2·③=-0.9y-0.7z=-39→0.9y+0.7z=39→y=(390-7z)/9④
3·①-2·②=1.3y-0.8z=2→y=(20+8z)/13⑤
将④代入⑤,得:z=30,再将z=30代入①中得:y=20,再将z=30,y=20代入①中得:x=10,
所以该方程组的解集为:
x=10
y=20
z=30
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