12y+9z=x,6(y+1/4)+9z=x,y+z=x
(x+y-z)(x-y+z)=
解方程组1、4x+9y=12,3y-2z=1,2x+6z=32、3x-y+2z=3,2x+y-3z=11,x+y+z=1
x-2y=-9 3x-y+z=4 y-z=3 2x+3y-z=12 2z+x=47 x+y+z=6 这是七年级下册数学1
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
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
解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值
(x-2y+z)/9=(2x+y+3z)/10=-(3x+2y-4z)/3=1 连等,求x,y,z,
X+Y+Z=?
3元1次方程x-2y=-9 3x-y+z=4{ y-z=3 { 2x+3y-z=122z+x=47 x+y+z=6
(1)3x+4y=15 2y-z=2 x+2z=9 (2) x+y+z=8 2x+3y-z=6 3x-y+z=8 (3)
三元一次方程组(1)x-2y=-9 y-z=3 2z+x=47 (2)3x-y+z=4 2x+3y-z=12 x+y+z
解下列方程组: (1)(3x-y+z=10 (x+2y-z=6 (x+y+z=12 (2)(2x+4y+3z=9(3x-