3x+2y+4z=8 2x+5y+7z=19 4x+6y+z=17
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3x+2y+4z=8 2x+5y+7z=19 4x+6y+z=17
(1)式*3-(3)式得
5x+11z=5 (4)式
(2)式*6-(3)式*5得
29z-8x=29 (5)式
(4)式*8+(5)式*5得
88z+145z=185
z=185/233
x=1-(19*11/233)=24/233
24*3/233+2y+4*185/233=8
y=526/233
5x+11z=5 (4)式
(2)式*6-(3)式*5得
29z-8x=29 (5)式
(4)式*8+(5)式*5得
88z+145z=185
z=185/233
x=1-(19*11/233)=24/233
24*3/233+2y+4*185/233=8
y=526/233
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
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
3x+2y+4z=8 2x+5y+7z=19 4x+6y+z=17
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-4
若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10
(1)3x+4z=7;2x+3y+z=9;5x-9y+7z=8 (2)3x+4y+z=14;x+5y+2z=17;2x+
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
x+2y+4z=17 2x+y+z=7 3x+y+2z=11
2x-y+2z=-17 3x+y-3z=-4 x+y+z=6
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10