9x-5y+z=5 9x+y+4z=14 -9x+3y-5z=-11
(1)3x+4z=7;2x+3y+z=9;5x-9y+7z=8 (2)3x+4y+z=14;x+5y+2z=17;2x+
解三元一次方程组:{9x-5y+z=5 {9x+y+4z=14 {-9x+3y-5z=-11
2) 4x-9z=17 3x+y+15z=18 x+2y+3z=2 (3) 2x+4y+3z=9 3x-2y+5z=11
(1) 4x-9z=17 3x+y+15z=18 x+2y+3z=2 (2)2x+4y+3z=9 3x-2y+5z=11
解方程一;{x+y-z=6,x-3y+2z=1,3x+2y-z=-7.②{3x+4z=7,2x+3y+z=9,5x-9y
{2x+y+Z=10 {2x+4y+3z=9 {2x+2y+2=16{3x+2y+5z=11 {x+y+2z=8{5x+
已知2x+3y-4z=7 3x-2y+z=3 x+5y+9z=20 则 x+y+z= 若x :y :z=2 :3 :7
若x+2y-9z=0,x-2y+5z=0,(x.y.z≠=0)求2x平方+3y平方+7z平方/x平方-4y平方+4z平方
x/10 = y/8 =z/9 求x+2y+3z/y-5z
x/2=y/3=z/5 x+3y-z/x-3y+z
2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13 这个方程怎么解?
2x+4y+3z=9① 3x-2y+5z=11② 5x-6y+7z=13③