3x-2y+z=4 x+y-z=5 4x-4y+3z=27

问题描述:

3x-2y+z=4 x+y-z=5 4x-4y+3z=27

3x-2y+z=4 ①
x+y-z=5②
4x-4y+3z=27 ③

②×4+③得8x-z=47④
②×2+①得5x-z=14⑤
④- ⑤得x=11
z=41
y=35