6X-4Y-3Z=36 3X+2Y-6Z=24 2X-3Y+3Z=18这题好难

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/08 17:14:02

6X-4Y-3Z=36 3X+2Y-6Z=24 2X-3Y+3Z=18这题好难
6X-4Y-3Z=36 3X+2Y-6Z=24 2X-3Y+3Z=18
这题好难

6X-4Y-3Z=36 3X+2Y-6Z=24 2X-3Y+3Z=18这题好难
6X-4Y-3Z=36 ①
3X+2Y-6Z=24 ②
2X-3Y+3Z=18 ③
①+③ 8X-7Y=54 ④
③-①+② -X+3Y=6 ⑤
联解④⑤ X=12 Y=6
带入③ Z=4

将2式乘以2得6X+4Y-12Z=48再与第一式相减得第4式:8Y-9Z=12
将3式乘以3得6X-9Y+9Z=54再与第一式相减得第5式:5Y-12Z=-18
解4,5式方程组求得Y=6;Z=4,再代入1,2,3任何一式得X=12

6X-4Y-3Z=36 ①
3X+2Y-6Z=24 ②
2X-3Y+3Z=18 ③
①+② 可得8X-7Y=54 ④
②+③*2 可得7X-4Y=60 ⑤
④*4 - ⑤*7 可得 X=12 Y=6
代入③ 可得Z=4

3x-y+z=4,2z+3y-z=12,x+y+z=6的解 求化简(x+3y+2z)(x-3y+6z)(x+3y+4z-2z)(x-3y+4z+2z) x+y+z=6 x+2y+3z=14 y+1=z 三元一次方程x+y+z=0 4x+2y+z=3 9x+3y+z=6x+y+z=04x+2y+z=3 9x+3y+z=6 2x-y+2z=6 3x+y-3z=-4 x+y+z=6 x+y+z=4 2x+3y-z=6 3x+2y+2z=10 x+y-z=6 x-3y+2z=1 3x+2y-z=4 阿 x+y-z=6,x-3y+2z=1,3x+2y-z=4 X+y-z=6;x-3y+2z=0;3x+2y-z=4 x+y-z=6 x-3y+2z=1 3x+2y-z=4 2x-y+2z=-17 3x+y-3z=-4 x+y+z=6 2x-y+2z=-17 3x+y-3z=-4 x+y+z=6 解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6} 解方程组2x+3y-z=12,3x-y+z=4,x+y+z=6 {x+y+z=0 4x+2y+z=3 9x+3y+z=6 {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 {3x-y+z=4,2x+3y-z=12,x+y+z=6 3x-y+z=4,2x+3y-z=12,x+y+z=6