2x-5y=-11,7x加4z=5,5x加2z=2.方程1 3x-y加z=4,2x加3y-2z=12,3x加2y=66.方程2.解这两个方程

解方程组 3x加2y加5z=2 x-2y-z=6 4x加2y-7z=30 2x-5y=-11,7x加4z=5,5x加2z=2.方程1 3x-y加z=4,2x加3y-2z=12,3x加2y=66.方程2.3x加2y加z=14,x加y加z=10,2x加3y-z=1.方程32x加y=42,2y加z=48,x加2z=48.方程4. 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 x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=? 三元一次方程 X-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 X=?Y=?Z=? 若2x+5y+4z=6,3x+y-7z=—4,求x+y-z补加20分 2x-5y=-11,7x加4z=5,5x加2z=2.方程1 3x-y加z=4,2x加3y-2z=12,3x加2y=66.方程2.解这两个方程 ..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)2X+4Y+3Z=93X-2Y+5Z=115X-6Y+7Z=13(2)X:Y=3:2Y:Z=5:4X+Y+Z=66(3)3X-Y+Z=32X+Y-3Z=11X+Y+Z=13以上3个题目为三元一次方程~ 已知x、y、z满足{x-2y+z=0;7x+4x-5z=0,求x:y:z的值. {x-y-z=-1 {3x+5y +7z=11 {4x-y+2z=-1 求X,Y, {5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=-1 六年级三元一次方程组第一题：{5x-3y+z=2 5x+2y-4z=3 -5x+y-z=2第二题：{x+y=-2 x+z=13 y+z=1第三题：{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 一道数学题!谢谢!我会加40分的!急!已知x,y,z满足方程组x-2y+z=0,7x+4y-5z=0,求x:y:z的值. 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21 3x+7y+4z=35,x+5y+2z=40,x+y+z=( )