解三元一次方程组：x+y-z=0 ① 3x+y=6 ① 2x-y+3z=2 ② x+2y-z=5 ② x-4y-2z+6=0 ③ 5x-3y+2z=4 ③x+y+z=-1 ① 2x+3y=5 ①4x-2y+3z=5 ② 3y-4z=3 ②y-z=8-2x ③ 4z+5x=7 ③

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• 解三元一次方程组：x+y-z=0 ① 3x+y=6 ① 2x-y+3z=2 ② x+2y-z=5 ② x-4y-2z+6=0 ③ 5x-3y+2z=4 ③
• （1）x+y-z=0 2x-y+3z=2 x-4y-2z+6=0(2)3x+y=6 x+2y-z=5 5x-3y+2z=4(3)x+y+z=-1 4x-2y+3z=5 y-z=8-2x
• 解三元一次方程组：x+y-z=0 ① 3x+y=6 ① 2x-y+3z=2 ② x+2y-z=5 ② x-4y-2z+6=0 ③ 5x-3y+2z=4 ③x+y+z=-1 ① 2x+3y=5 ①4x-2y+3z=5 ② 3y-4z=3 ②y-z=8-2x ③ 4z+5x=7 ③
• （1）x+y-z=0 2x-y+3z=2 x-4y-2z+6=0(2)3x+y=6 x+2y-z=5 5x-3y+2z=4(3)x+y+z=-1 4x-2y+3z=5 y-z=8-2x（4）2x+3y=5 3y-4z=3 4z+5x=7三元一次方程,千万别用科学计算器来算裁图,
• x+y-z=2 5x+2y-2z=9 3x-y-3z=4
• 2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X=18