x:y:z=3:4:5,2x-3y+4z=28,求4X+3Y-2Z的值
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x:y:z=3:4:5,2x-3y+4z=28,求4X+3Y-2Z的值
![x:y:z=3:4:5,2x-3y+4z=28,求4X+3Y-2Z的值](/uploads/image/z/17905450-58-0.jpg?t=x%3Ay%3Az%3D3%3A4%3A5%2C2x-3y%2B4z%3D28%2C%E6%B1%824X%2B3Y-2Z%E7%9A%84%E5%80%BC)
解设
x=3k y=4k z=5k
由2x-3y+4z=28得
6k-12k+20k=28
k=2
所以x=6 y=8 z=10
4X+3Y-2Z
=4x6+3x8-2x10
=28
x=3k y=4k z=5k
由2x-3y+4z=28得
6k-12k+20k=28
k=2
所以x=6 y=8 z=10
4X+3Y-2Z
=4x6+3x8-2x10
=28
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