1.若x是有理数,且x≠3,化简lx-3l分之x-3.
问题描述:
1.若x是有理数,且x≠3,化简lx-3l分之x-3.
答
当x>3时
(x-3)/|x-3|=(x-3)/(x-3)=1
当xx-3(x-3)/|x-3|=(x-3)/-(x-3)=-1