{x-y+z=6,x+3y=-1,y+2z=3
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{x-y+z=6,x+3y=-1,y+2z=3
{x-y+z=6,x+3y=-1,y+2z=3
{x-y+z=6,x+3y=-1,y+2z=3
x8/3 y-11/9 z19/9
【参考答案】
由x+3y=-1得
x=-1-3y
由y+2z=3得
z=(3-y)/2
所以:
-1-3y-y+(1/2)(3-y)=6
-1-4y+(3/2)-(1/2)y=6
(1/2)-(9/2)y=6
1-9y=12
y=-11/9
于是 x=-1+(11/3)=8/3
z=(1/2...
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【参考答案】
由x+3y=-1得
x=-1-3y
由y+2z=3得
z=(3-y)/2
所以:
-1-3y-y+(1/2)(3-y)=6
-1-4y+(3/2)-(1/2)y=6
(1/2)-(9/2)y=6
1-9y=12
y=-11/9
于是 x=-1+(11/3)=8/3
z=(1/2)×(38/9)=19/9
所以 方程组的解是:
x=8/3, y=-11/9, z=19/9
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x-y+z=6,
x+3y=-1,(2)
y+2z=3 (3)
用代入法,
得
x = 8/3, y = -11/9, z = 19/9
x+y+z=6 x+2y+3z=14 y+1=z
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