{x-2y+z=0 {3x+y-2z=0 {7x+6y+7z=100{x-2y+z=0{3x+y-2z=0{7x+6y+7z=100
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{x-2y+z=0{3x+y-2z=0{7x+6y+7z=100{x-2y+z=0{3x+y-2z=0{7x+6y+7z=100{x-2y+z=0{3x+y-2z=0{7x+6y+7z=100{x-2
{x-2y+z=0 {3x+y-2z=0 {7x+6y+7z=100{x-2y+z=0{3x+y-2z=0{7x+6y+7z=100
{x-2y+z=0 {3x+y-2z=0 {7x+6y+7z=100
{x-2y+z=0
{3x+y-2z=0
{7x+6y+7z=100
{x-2y+z=0 {3x+y-2z=0 {7x+6y+7z=100{x-2y+z=0{3x+y-2z=0{7x+6y+7z=100
y是5,x是3.z是7
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方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=18 2x+5y+3z= -1