解方程组x+y+z=4,2x+y-z=1,3x+2y-4z=-3

问题描述:

解方程组x+y+z=4,2x+y-z=1,3x+2y-4z=-3
再问一道1/x+1/y=1/6,1/y+1/2=10,1/2+1/x=2/3*1/5

x + y+ z=4
2x+ y - z=1
3x+2y=5
3x+2y-4z=-3
4z=8,z=2
2x+y-z-x-y-z=-3
x-2z=-3
x-4=-3
x=1
y=1����һ����.