2) 4x-9z=17 3x+y+15z=18 x+2y+3z=2 (3) 2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13

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2)4x-9z=173x+y+15z=18x+2y+3z=2(3)2x+4y+3z=93x-2y+5z=115x-6y+7z=132)4x-9z=173x+y+15z=18x+2y+3z=2(3)2x

2) 4x-9z=17 3x+y+15z=18 x+2y+3z=2 (3) 2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13
2) 4x-9z=17 3x+y+15z=18 x+2y+3z=2 (3) 2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13

2) 4x-9z=17 3x+y+15z=18 x+2y+3z=2 (3) 2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13
2)2式乘以2减去3式得5X+27Z=34记为4式,1式乘以3与4式相加得17X=85,所以X=5,代入1式得Z=1./3,一起代入3式得Y=-2
3)2式乘以2加上1式得8X+13Z=31,记为4式,2式乘以3减去3式得4X+8z=20,记为5式,再5式乘以2减去4式得3Z=9,所以Z=3,代入得X=-1,Y=1/2

4x-9z=17 3x+y+15z=18 x+2y+3z=24x-9z=17 3x+y+15z=18 x+2y+3z=2方程组 4X-9Z=17 3X+Y+15Z=18 X+2Y+3Z=2 4x-9z=17 3x+y+15z=18 x+2y+3z=2 {4x-9z=17 3x+y+15z=18 x+2y+3z=2 {4x-9z=17{3x+y+15z=18{x+2y+3z=2 解三元一次方程组!请写具体的过程!(1)2x+3y=10 (2)x:y=3:2 (3)4x-9z=17 (4)0.4x+0.3y-0.2z=45z+2z=6 y:z=5:4 3x+y+15z=18 0.6x-0.5y+0.3z=53y+5z=4 x+y+z=66 x+2y+3z=2 0.3x+0.2y+0.5z=22第一个错了!(1)2x+3y=10 5z+2x=63y+5z=4 4x-9z=17 3x+y+15z=18 x+2y+3z=2x+y+z=26 x-y=1 2x+z-y=18 2x+3y-z=9,x+y+z=15,5x-4y-z=0 2x+3y+z=13 4x^2+9y^2+z^2-2x+15y+3z=82 求x,y,z 解方程组:{4X-9Z=17 3X+Y+15Z=18 X+2Y+3Z=2(写过程) 4X+9Z=12 {3Y-2Z=17X+5Z=4又4分之33X-Y+2Z=3{2X+Y-3Z=11X+Y+Z=66 ..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 3x+4y+z=14 x+5y+2z=17 2x+2y-z=3 第一题(上面是) 9x-5y+z3x+4y+z=14x+5y+2z=172x+2y-z=3第一题(上面是)9x-5y+z=-69x+y+4z= 3-9x+3y-5z=0第二题解方程组 Y=2W-7 5X+3Y+2Z=2 3X-4Z=4 二题4X-9Z= 17 3X+Y+15Z...Y=2W-7 5X+3Y+2Z=2 3X-4Z=4 二题4X-9Z= 17 3X+Y+15Z=18 X+2Y+3Z=2 第一题那Y改成X 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 2) 4x-9z=17 3x+y+15z=18 x+2y+3z=2 (3) 2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13 问5道3元一次方程组题目(1) y=2x-7{ 5x+3y+2z=23x-4z=4 (2) 4x+9y=12{3y-2z=17x+5z=19/4(3)4x-9z=17{3x+y+5z=18x+2y+3z=2(4) 2x+4y+3z=9{3x-2y+5z=115x-6y+7z=13(5) x:y=3:2{y:z=5:4x+y+z=66 (1)x:y:z=3:2:5,2x+3y+8=5 (2)5x-3y+z=5,4x+3y-2z=9x-5y-z=-17