当x>1时,化简|x-1|+2|1-x|+|x|
问题描述:
当x>1时,化简|x-1|+2|1-x|+|x|
答
因为x>1,所以|x-1|= x-1 ,
|1-x|=x-1 ,|x| = x
所以,|x-1|+2|1-x|+|x|
=x-1+2(x-1)+x
=x-1+2x-2+x
=4x-3