解方程组:2x+3y+2z=19,3x+2y+2z=17,2x+2y+3z=13.
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解方程组:2x+3y+2z=19,3x+2y+2z=17,2x+2y+3z=13.
![解方程组:2x+3y+2z=19,3x+2y+2z=17,2x+2y+3z=13.](/uploads/image/z/1238149-37-9.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84%3A2x%2B3y%2B2z%3D19%2C3x%2B2y%2B2z%3D17%2C2x%2B2y%2B3z%3D13.)
答:由题意得 2x+3y+2z=19 ①
3x+2y+2z=17 ②
2x+2y+3z=13 ③
由②-①得 x-y=-2 ④
由②-③得 x-z=4 ⑤
由①-③得 y-z=6 ⑥
所以得x=5
y=7
z=1
3x+2y+2z=17 ②
2x+2y+3z=13 ③
由②-①得 x-y=-2 ④
由②-③得 x-z=4 ⑤
由①-③得 y-z=6 ⑥
所以得x=5
y=7
z=1
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解方程组:2x+3y+2z=19,3x+2y+2z=17,2x+2y+3z=13.
帮我解方程组:3x-y+z=3,2x+y-3z=11,x+y+z=12.x=?y=?z=?