5x+2y-3z=1 3x-2y+2z=14 4x-2x-5z=9这个方程组咋解(这是三元一次方程)
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5x+2y-3z=1 3x-2y+2z=14 4x-2x-5z=9这个方程组咋解(这是三元一次方程)
5x+2y-3z=1 3x-2y+2z=14 4x-2x-5z=9这个方程组咋解(这是三元一次方程)
5x+2y-3z=1 3x-2y+2z=14 4x-2x-5z=9这个方程组咋解(这是三元一次方程)
5x+2y-3z=1 (1)
3x-2y+2z=14 (2)
4x-2y-5z=9 (3) 这里题目修改成了y
(1)+(2)得
8x-z=15 (4)
(1)+(3)得
9x-8z=10 (5)
(4)×8-(5)得
55x=110
x=2
把x=2代入(4)得
16-z=15
∴z=1
把x=2,z=1代入(1)得
10+2y-3=1
2y=-6
y=-3
∴x=2
y=-3
z=1
x/2=y/3=z/5 x+3y-z/x-3y+z
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
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x+y+z=6 x+2y+3z=14 y+1=z
若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值
方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=18 2x+5y+3z= -1
x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2
{x+y+z=1 x-2y+3z=5 2x-3y-3z=-8
2x-y+3z=3 {3X+Y-2Z=-1 X+Y+Z=5
x+y+z=2 x-3y+2z=1 2x+2y+z+5 要具体步骤..
x+y+z=-5,3x+y+z=1,4x+3y+2z=-2快
3x+2y+z=14 ,x+y+z=10,z+2x+3y=1 5
3x-y+2z=-1 4x+y+z=5 x-2y-z=-2
x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5