√(x²-2x+1)√(x²+6x+9)
=√(x-1)²√(x+3)²
=|x-1||x+3|
∵-3＜x＜3
∴x+3＞0
当-3
设-3＜x＜3,化简√（x²-2x+1）√（x²+6x+9）
1个回答
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