2x+3y+z=8 4x-y-z=10 x+2y-z=1
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2x+3y+z=84x-y-z=10x+2y-z=12x+3y+z=84x-y-z=10x+2y-z=12x+3y+z=84x-y-z=10x+2y-z=12x+3y+z=8①4x-y-z=10②x+
2x+3y+z=8 4x-y-z=10 x+2y-z=1
2x+3y+z=8 4x-y-z=10 x+2y-z=1
2x+3y+z=8 4x-y-z=10 x+2y-z=1
2x+3y+z=8 ①
4x-y-z=10 ②
x+2y-z=1 ③
由①+②得 6x+2y=18 →3x+y=9 ④
由①+③得 3x+5y=9 ⑤
由④-⑤得 -4y=0 y=0
将y=0代入④得3x=9 x=3
将x=3 y=0 代入①得 6+z=8 z=2
所以x=3 y=0 z=2
祝学习快乐!
①2x+3y+z=8 ②4x-y-z=10 ③x+2y-z=1
① + ② → ④ 3x+y=9
② - ③ → ⑤ x-y=3
④ + ⑤ → x=3 即代入⑤中y=0 ，∴z = 2
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z
2x+z=10 x+y-z=4 3x-y-z=0
2x+3y+z=8 4x-y-z=10 x+2y-z=1
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
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x+2y+3z=10,x-y+4z=10,x+3y+2z=2
x+2y+3z=10,x-y+4z=10,x+3y+2z=2
4x+y+z=-3 2x+3y-4z=-10 x+2y-z=-1
x:y:z=3:4:5 2x-3y+2z=8 x-y-2z=?