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2个回答
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16x2-72x2+81
=32-2×8×9+9²
=64-2×8×9+9²-32
=8²-2×8×9+9²-32
=(8-9)²-32
=1-32
=-31
=32-2×8×9+9²
=64-2×8×9+9²-32
=8²-2×8×9+9²-32
=(8-9)²-32
=1-32
=-31
更多追问追答
追问
16x^4-72x^2+81 这个。 = =。
追答
16x^2-72x^2+81
=-56x²+81
=9²-56x²
=(9+√56x)(9-√56x)
=(9+2√14x)(9-2√14x)
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