问题
解答题
若
|
答案
设
=x 2
=y 3
=k，则x=2k，y=3k，z=-5k；z -5
所以
=2x+y+3z 2x
=2×2k+3k+3×(-5) 2×2k
=-2．-8k 4k
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若
|
设
=x 2
=y 3
=k，则x=2k，y=3k，z=-5k；z -5
所以
=2x+y+3z 2x
=2×2k+3k+3×(-5) 2×2k
=-2．-8k 4k