Question

解方程！急！！过程！！

方程组2x+y=5,2y+z=-3,2z+x=7

Answer 1

2X+Y=5 X=(5-Y)/2 2Y+Z=-3 Y=(-3-Z)/2
X=(5-Y)/2=2.5-Y/2=2.5+(3+Z)/2=2.5+1.5+Z/2=4+Z/2
2Z+X=7 X=7-2Z
7-2Z=4+Z/2 Z=1.2
X=7-2*1.2=4.6
Y=(-3-1.2)/2=2.1

Answer 2

y=5-2x代入二式
2*(5-2x)+z=-3得
z=-3-2*(5-2x)代入三式求解即可

Answer 3

2x=5-y