2X+Y=10 4Y+Z=21 5X-Z=10求x,y,z的结果!
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2X+Y=10 4Y+Z=21 5X-Z=10求x,y,z的结果!
2X+Y=10 4Y+Z=21 5X-Z=10
求x,y,z的结果!
2X+Y=10 4Y+Z=21 5X-Z=10求x,y,z的结果!
{2X+Y=10 (1)
{4Y+Z=21 (2)
{5X-Z=10 (3)
(2)+(3)得4Y+5X=31 (4)
由(1)得Y=10-2X (5)
把(5)代入(4)得4(10-2X)+5X=31 -8X+5X=31-40 -3X=-9 X=3
把X=3代入(5)得Y=10-2X=10-2×3=4
把Y=4代入(2)得16+Z=21 Z=5
∴X=3 Y=4 Z=5
由 5X-Z=10 得 Z=5X-10
所以4Y+Z=21 可化为 4Y+5X=31 与 2X+Y=10 联立
可解出结果
x=3\y=4\z=5
{4y+z=21}+{5x-z=10}={4y+5x=31}
4*{2x+y=10}-{4y+5x=31}={x=3}
2x+y=10→8x+4y=40
4y+z=21
→8x-z=19
5x-z=10
→3x=9→x=3
2x+y=10
→y=4→z=5
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
x-y-2z=10 y-3z=-4 3x-y+5Z=21 三元一次方求大神x-y-2z=10y-3z=-43x-y+5Z=21
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21
-2X+3Y+Z=-4-X-5Y-2Z=-13X+Y-Z=10
x+y+2z=5 2x-y-z=4 3x+y-3z=10
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
2x+z=10 x+y-z=4 3x-y-z=0
三元一次方程组,1.x-2y+z=9 2x+y+3z=10 3x+2y1.x-2y+z=92x+y+3z=103x+2y-z2.3x-5y+2z=14x+5y-z=5X-5y+3z=-23.7x+2y-z=76x-y+z=74x+3y+z=94.4x+3y-2z=-75x-6y+z=12x+z=-25.2x+3y-4z=-23x-2y+5z=262x+5z=31
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