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将 9 . 5 2 变形正确的是 ( )
9 . 5 2 = 9 2 + 0 . 5 2
9 . 5 2 = ( 10 + 0 . 5 ) ( 10 - 0 . 5 )
9 . 5 2 = 10 2 - 2 × 10 × 0 . 5 + 0 . 5 2
9 . 5 2 = 9 2 + 9 × 0 . 5 + 0 . 5 2
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