﹛x+2y+2z=3 3x+y-2y=7 2x+3y-2z=10
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﹛x+2y+2z=3 3x+y-2y=7 2x+3y-2z=10
﹛x+2y+2z=3(1)
3x+y-2y=7(2)
2x+3y-2z=10(3)
(1)+(2)得:
4x+3y=10;(4)
(1)+(3)得:
3x+5y=13(5)
(4)×5-(5)×3得:
20x-9x=50-39;
11x=11;
x=1;
带入(4)得:
1+3y=10;
3y=9;
y=3;
带入(1)得:
1+6+2z=3;
2z=-4;
z=-2;
如果本题有什么不明白可以追问,
3x+y-2y=7(2)
2x+3y-2z=10(3)
(1)+(2)得:
4x+3y=10;(4)
(1)+(3)得:
3x+5y=13(5)
(4)×5-(5)×3得:
20x-9x=50-39;
11x=11;
x=1;
带入(4)得:
1+3y=10;
3y=9;
y=3;
带入(1)得:
1+6+2z=3;
2z=-4;
z=-2;
如果本题有什么不明白可以追问,
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