若a2−2a+1=1-a,則a的取值範圍為______.

若a2−2a+1=1-a,則a的取值範圍為______.

∵a2−2a+1=(a−1)2=|a-1|=1-a,∴a-1≤0,∴a≤1.故答案為a≤1.