Question

解三元一次方程组X+Y-Z=2,(1) Y+Z-X=4,(2) Z+X-Y=6;(3)

Answer 1

整理得

x+y-z=2 ①

-x+y+z=4 ②

x-y+z=6 ③

①+②得 2y0z=6 ④

①-③得 2y-2z=-4 ⑤

④-⑤得 2z=10,z=5

代入z到④,得y=3

代入y和z到①,得x=4

因此 x=4 y=3 z=5

o(∩_∩)o