x=y+z 2x+2y-3z=5 x-y-2z=-3 三元一次方程求解
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x=y+z 2x+2y-3z=5 x-y-2z=-3 三元一次方程求解
x=y+z 2x+2y-3z=5 x-y-2z=-3 三元一次方程求解
x=y+z 2x+2y-3z=5 x-y-2z=-3 三元一次方程求解
解;
x=y+z ①
2x+2y-3z=5 ②
x-y-2z=-3 ③
将①代入②
得 2(y+z)+2y-3z=5
2y+2z+2y-3z=5
4y-z=5 ④
将①代入③
得 y+z-y-2z=-3
-z=-3
z=3 ⑤
将⑤代入④
得 4y-3=5
y=2 ⑥
将⑤和⑥代入①
得 x=2+3
x=5
综上所述
得 x=5
y=2
z=3
x=5,y=2,z=3
x/2=y/3=z/5 x+3y-z/x-3y+z
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