合聚咖

合聚咖

当k取何值时,多项式4(1/2x-y+3/2)-2(4+x-ky)的值为定值

admin

4(1/2x-y+3/2)-2(4+x-ky)

=2x-4y+6-8-2x+2ky

=(2k-4)y-2

值为定值

2k-4=0

k=2