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