4x-5z=17 3x+y+15z=18 x+2y+3z=2 用消元法 你们的方法我都看不懂啊

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 ..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 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 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 4x-9z=17 3x+y+15z=18 x+2y+3z=2x+y+z=26 x-y=1 2x+z-y=18 解三元一次方程:{x-5y-3z=-15,y+4z=17,2x-z=0 三元一次方程1.｛3x-y+z=4,｛2x+3y-z=12,｛x+y+z=6 .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, 三元一次计算练习题x-2y=-9y-z=32z+x=47y=2x-75x+3y+2z=23x-4z=44x+9y=123y-2z=17x+5z=四分之十九4x-9z=173x+y+15z=18x+2y+3z=22x+4y+3z=93x-2y+5z=115x-6y+7z=13能写多少就写多少最好都写！ 关于三元一次方程组,速求啊,1.x-2y=-9y-z=32z+x=472.3x-y+z=42x+3y-z=12x+y+z=63.y=2x-75x+3y+2z=23x-4z=44.4x+9y=123y-2z=17x+5z=四分之195.4x-9z=173x+y+15z=18x+2y+3z=26.2x+4y+3z=93x-2y+5z=115x-6y+7z=137.x:y=3:2y:z=5:4x+y+z=668.甲、乙、丙 2x+3y-z=9,x+y+z=15,5x-4y-z=0 (x+y):(y+z):(z+x)=3:4:5 3x+y-z=-4已知(x+y):(y+z):(z+x)=3:4:5 ；3x+y-z=-4求x y z 4X-5z=17 3x+y+15z=18 x+2y+3z=2 解三元一次不等式要过程 4x-5z=17 3x+y+15z=18 x+2y+3z=2 用消元法 你们的方法我都看不懂啊 1.三元一次方程 ｛3x+9y=12,｛2x+3y-z=12,｛x+y+z=6 2.｛4x-9z=17,｛3x+y+15z=18,｛x+2y+3z=2,3.｛2x+4y+3z=9,｛3x-2y+7z=11,｛5x-6y+7z=13,