慎单杠
(1)分母不为0,即x≠0
根号内为非负数,即1-x²≥0,x²≤1,-1≤x≤1
即 -1≤x<0或0<x≤1
即[-1,0)U(0,1]
(2)分母不为0,即x²-3x+2≠0
x≠1且x≠2
即{x|x≠1且x≠2}
根号内为非负数,即1-x²≥0,x²≤1,-1≤x≤1
即 -1≤x<0或0<x≤1
即[-1,0)U(0,1]
(2)分母不为0,即x²-3x+2≠0
x≠1且x≠2
即{x|x≠1且x≠2}
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