{x+2y+3z=28 {x:y:z=1:2:3
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{x+2y+3z=28{x:y:z=1:2:3{x+2y+3z=28{x:y:z=1:2:3{x+2y+3z=28{x:y:z=1:2:3x:y:z=1:2:3y=2xz=3x代入前面的式子x+4x+
{x+2y+3z=28 {x:y:z=1:2:3
{x+2y+3z=28 {x:y:z=1:2:3
{x+2y+3z=28 {x:y:z=1:2:3
x:y:z=1:2:3
y=2x
z=3x
代入前面的式子
x+4x+9x=28
14x=28
x=2
y=2x=4
z=3x=6
解是:
x=2,y=4,z=6
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{x+2y+3z=28 {x:y:z=1:2:3