① x+2y+3z=26 ②2x+3y+z=34③ 3x+2y+z=39
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① x+2y+3z=26 ②2x+3y+z=34③ 3x+2y+z=39
![① x+2y+3z=26 ②2x+3y+z=34③ 3x+2y+z=39](/uploads/image/z/4913593-25-3.jpg?t=%E2%91%A0+x%2B2y%2B3z%3D26+%E2%91%A12x%2B3y%2Bz%3D34%E2%91%A2+3x%2B2y%2Bz%3D39)
就用通俗的方法给你解答吧(其实用线性代数很方便):
3x+2y+z=39 (1)
2x+3y+z=34 (2)
x+2y+3z=26 (3)
(1)式-(2)式得:x-y=5 (4)
3*(2)-(3)式得:5x+7y=76 (5)
由(4)(5)两式得x=111/12,y=51/12,z=11/4
3x+2y+z=39 (1)
2x+3y+z=34 (2)
x+2y+3z=26 (3)
(1)式-(2)式得:x-y=5 (4)
3*(2)-(3)式得:5x+7y=76 (5)
由(4)(5)两式得x=111/12,y=51/12,z=11/4
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
① x+2y+3z=26 ②2x+3y+z=34③ 3x+2y+z=39
3x+2y+z=39①2x+3y+z=34②x+2y+3z=26③要过程
x/2=y/3=z/5 x+3y-z/x-3y+z
① x+2y+3z=26 ②2x+3y+z=34③ 3x+2y+z=29 过程!
① x+2y+3z=26 ②2x+3y+z=34③ 3x+2y+z=29
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