1.{4X+9Y=12{3Y-2Z=-1{7X+5Z=四分之十九2.[2X+4Y+3Z=9[3X-2Y+5Z=11[5X-6Y+7Z=13

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1.{4X+9Y=12{3Y-2Z=-1{7X+5Z=四分之十九2.[2X+4Y+3Z=9[3X-2Y+5Z=11[5X-6Y+7Z=131.{4X+9Y=12{3Y-2Z=-1{7X+5Z=四分之十

1.{4X+9Y=12{3Y-2Z=-1{7X+5Z=四分之十九2.[2X+4Y+3Z=9[3X-2Y+5Z=11[5X-6Y+7Z=13
1.{4X+9Y=12
{3Y-2Z=-1
{7X+5Z=四分之十九
2.[2X+4Y+3Z=9
[3X-2Y+5Z=11
[5X-6Y+7Z=13

1.{4X+9Y=12{3Y-2Z=-1{7X+5Z=四分之十九2.[2X+4Y+3Z=9[3X-2Y+5Z=11[5X-6Y+7Z=13
1.{4X+9Y=12 1)
{3Y-2Z=-1 2)
{7X+5Z=19/4 3)
1)-2)*3,得
4x+6z=15 4)
4)*7-3)*4,得
22z=86
z=43/11
代入2),得
y=25/11
代入1),得
x=-93/44
2.2X+4Y+3Z=9 1)
3X-2Y+5Z=11 2)
5X-6Y+7Z=13 3)
2)*2+1,得
8x+13z=31 4)
2)*3-3),得
4x+8z=20 5)
5)*2-4),得
3z=9
z=3
代入5),得
x=-1
将x=-1,z=3代入2),得
y=1/2

1.. X=-93/44 Y=25/11 Z=43/11
2.. X=37/2 Y=-1/4 Z=-9
1过程: 式1-式2 *3=4X+9Y-9Y+6Z=15 =>4X+6Z=15 计为式4
式4*7-式3*4=28X+42Z-28X-20Z=105-19/4*4 => Z=43/11
代入式4,可以算出X=-93/...

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1.. X=-93/44 Y=25/11 Z=43/11
2.. X=37/2 Y=-1/4 Z=-9
1过程: 式1-式2 *3=4X+9Y-9Y+6Z=15 =>4X+6Z=15 计为式4
式4*7-式3*4=28X+42Z-28X-20Z=105-19/4*4 => Z=43/11
代入式4,可以算出X=-93/44,代入式1,可以算出Y=25/11
2过程: 式1+式2=5X+2Y+8Z=20 计为式4
式4-式3=8Y-Z=7 计为式5
式1*3-式2*2=16Y-Z=5 计为式6
式6-式5=8Y=-2 所以Y=-1/4 ,代入式5,所以Z=-9,代入式1,得X=37/2

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1. {4X+9Y=12
{3Y-2Z=-1
{7X+5Z=四分之十九
x=(12-9y)/4
z=(3y+1)/2
7(12-9y)/4+5(3y+1)/2=19/4
84-63y+10y+10=19
94-53y=19
94-19=53y
y=75/53
2.[2X+4Y+3Z=9
[3X-...

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1. {4X+9Y=12
{3Y-2Z=-1
{7X+5Z=四分之十九
x=(12-9y)/4
z=(3y+1)/2
7(12-9y)/4+5(3y+1)/2=19/4
84-63y+10y+10=19
94-53y=19
94-19=53y
y=75/53
2.[2X+4Y+3Z=9
[3X-2Y+5Z=11
[5X-6Y+7Z=13
3z=9-2x-4y z=(9-2x-4y)/3
3x-2y+5*(9-2x-4y)/3=11 9x-6y+45-10x-20y=33 x=12-26y
5(12-26y)-6y+7(9-2x-4y)/3=13
60-130y-6y+(63-14x-28y)/3=13
180-390y-18y+63-14(12-26y)-28y=39
411-800y=39
y=372/800=93/200=0.465
x=12-26*0.465=12-12.09=-0.09
z=(9-2*-0.09-4*0.465)/3=(9+0.18-1.86)/3=2.44

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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 ..1.x+y+z=26,2.4y+3z=7,y-z=1,3x+2z=17,x+2y-z=18 9x-7y=173.x-7y+3z=17 4.2x+4y+3z=95x-6y-z=24 3x-2y+5z=113x+7y-2z=1 5x-6y+7z=131.x+y+z=26,y-z=1x+2y-z=18 2.4y+3z=7,3x+2z=11,9x-7y=17 3.x-7y+3z=17 5x-6y-z=24 3x+7y-2z=14.2x+4y+3z=93x-2y+5z=11 5x-6y+7z=13 1.x - 5y -3z =3 2.4x+9y=12 3.3x-y+2z=3y+4z=3 3y-2z=1 2x+y-3x=112x - z=1 2x+6z=3 x+y+z=12 三元一次方程组(1)x-2y=-9 y-z=3 2z+x=47 (2)3x-y+z=4 2x+3y-z=12 x+y+z=6 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 数学题在线解答:三元一次方程组;(1)X+Y+Z=0,4X+2Y+Z=0,Z=2;(2)9X+3Y+Z=0,X-Y+Z=0,Z=-3,(3)4X+2Y+Z=5,4X-2Y+Z=1Z=-1;(5)5X+2Y+Z=12,4X+3Y+Z=13,Z=3 三元一次方程解 1.{x+y-z=5 {3x+2y+z=2 {2x-2y+z=-31.{x+y-z=5 2.{9x-5y+x=-6 3.{x-y=3 4.{x+y=3 5.{4x-2y+z=7{3x+2y+z=2 {9x+y-2z=3 {x+z=7 {y+z=4 {2x-y-3z=28{2x-2y+z=-3 {-9x+3y-5z=0 {y-z=6 {z+x=5 {x+y-2z=13 x+2y-z=-5 x+y+2z=-1 3x+4y-2z=-12x+2y-z=3 2x+y+3z=0 4x+z=-4 x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少, 三元一次方程组解法 4x+y-z=12 x+y+z=26 3x+2y+z=-5 x-y=1 x-y+5z=1 2x-y+z=18 急 急、、、、、、、、、、 1.x+y+z=21,x-y=1,2x+z-y=13.2.3x+2y+z=13,x+y+2z=7 ,2z+3y-z=12 3.x∶y=3∶2,y∶x=5∶4,2x+y+z3.x∶y=3∶2,y∶x=5∶4,2x+y+z=96 方程题4道1.4(x-y-1)=3(1-y)+3.5 (x/2)+(y/3)=2 2.2(x-y)/3-(x+y)/4=13/6 6(x+y)-4(2x-y)=16 3.3x-y+z=3 2x+y-3z=9 x+y+z=12 4.5x-4y+4z=13 2x+7y-3z=19 3x+2y-z=18 三元一次方程:x+3y+2z=2 3x-y+2z=3 3x+2y-4z=3 2x+y-3z=11 2x-y=7 x+y+z=12还有:7x+2y-z=76x-y+z=74x+3y+z=9 好了,2x+y-3z=11 2x-y=7x+y+z=12 解下列三元一次方程组(1)x-2y=-9 y-z3 2z+x=47(2)3x-y+z=4 2x+3y-z=12 x+y+z=6 4x+9y=12 3y-2y+5z=11 5x-6y+7z=13 求:x y z等于多少 初二数学三元一次方程计算题应用题求解, 3x-y+2z=3 2x+y-3z=11 x+y+z=12 3x-4z=7 2x+3y+z=9 5x-9y+7z=8 y=2x-7 5x+3y+2z 3x-4z=2 2x-y+2z=8 y+2z=-2 3x+y-4z=1x+y-z=11 y+z-x=5 二元一次方程组和三元一次!1.x/2-y/4=1 x/3+y/5=-1/152.3x-2y+z=32x+y-z=44x+3y+2z=-103.2x+6y+3z=63x-12y+7z=-34x-3y+4z=11 解三元一次方程组.速回.(1)X+Y+Z=25 X-Y=1 2X+Y-Z=18(2)X-Y-Z=0 X+Y-3Z=4 2X+3Y-5Z=14(3) X-2Y=-9 Y-Z=3 2Z+x=47(4)3X-y+z=4 2X+3Y-Z=12 X+Y+z=-28(5)4X+9Y=13 3y-2Z=-1 7X+5Z=17速回 我会奖励积分