3x-2y+z=6 x+3y-z=4 7x-5y+3z=-2
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3x-2y+z=6 x+3y-z=4 7x-5y+3z=-2
3x-2y+z=6 x+3y-z=4 7x-5y+3z=-2
3x-2y+z=6 x+3y-z=4 7x-5y+3z=-2
3x-2y+z=6 (1)
x+3y-z=4 (2)
7x-5y+3z=-2 (3)
(1)+(2)
4x+y=10 (4)
(2)×3+(3)
10x+4y=10
5x+2y=5 (5)
(4)×2-(5)
8x-5x=20-5
3x=15
所以
x=5
y=10-4x=-10
z=x+3y-4=-29
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z
1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38
解三元一次方程组 ①2x-y+z=1 3x+y -2z=2 X+2y-z=3 ②x-4y+z=-3 2x+Y-Z=18 X-Y-Z=7 ③4x+4y+2z=7 6X-4y-z=6 2x-y+z=1
若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=?
已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z
已知有理数x、y、z满足条件|x-z-2|+(3x-6y-7)^2+|3y+3z-4|=0,求x、y、z
已知:4x-3y-6z=0,x+2y-7z=0.求出x-y+z÷x+y+z=?
已知4x-3y-6z=0,x+2y-7z=0,则x-y+z/x+y+z=_________
已知4x-3y+6z=0 x+2y-7z=0 则x-y+z/x+y-z=?
4x-3y-6z=0,x+2y-7z=0,x-y+z/x+y+z=?
已知{4x-3y-6z=0、x+2y-7z=0,则x-y+z:x+y+z=
4x-3y-6z=0,x+2y-7z=0是一个方程组,那么x-y+z/x+y+z的值等于
三元一次方程组2x+z=3 3x+y-z=8 x+3y+2z=3 5x+2y-3z=2 x+2y+z=6 7x-2y-4z=262x+z=3 3x+y-z=8 x+3y+2z=3 5x+2y-3z=2 x+2y+z=6 7x-2y-4z=26
x+y/2=z+x/3=y+z/4 x+y+z=27
x+2y=3x+2z=4y+z 求x:y:z
3x-y+z=4,2z+3y-z=12,x+y+z=6的解