问题
填空题
已知
|
答案
设
=x 2
=y 3
=k，z 4
则x=2k，y=3k，z=4k，
=x+3y-z 2x-y+z
=2k+9k-4k 4k-3k+4k
=7k 5k
．7 5
故
的值是x+3y-z 2x-y+z
．7 5
搜题请搜索小程序“爱下问搜题”
已知
|
设
=x 2
=y 3
=k，z 4
则x=2k，y=3k，z=4k，
=x+3y-z 2x-y+z
=2k+9k-4k 4k-3k+4k
=7k 5k
．7 5
故
的值是x+3y-z 2x-y+z
．7 5