4x+5y=7 4x+5y+9z=73x-7y=9 3x+5y+7z=4x=?y=?2x+7y+9z=6 x=?y=?

x+y=5 2x+3y-z=9 x-y+z=4 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 ..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 x+y+z=4x-5y=y-x+6z,xyz不等0,x:y:z=? (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 4x+9y=12 3y-2y+5z=11 5x-6y+7z=13 求：x y z等于多少 {5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=-1 X/4=Y/5=Z/7则x+y+z/z=? (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 5x+4y+z=-7 4x+y-4z=-13 x+y+z=0 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? 已知5x=3y,4z=7y,求x:y:z 六年级三元一次方程组.解下列方程组：(1)5x-3y+z=25x+2y-4z=3-5x+y-z=2(2)x-y-z=-13x_5y+7z=114x-y+2z=-1(3)9x-5y+z=-69x+y+4z=3-9x+3y-5z=0(4)x+y=22x+z=-27y+z=13 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 解方程组 x+y+z=5 2x-y-z=4 3x-2y-z=9 2x+3y-z=9,x+y+z=15,5x-4y-z=0 X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21 若3x+7y+z=5,4x+10y+z=3,则x+y+z=?