factorise (25x²-81y²)16x²y²/(5x-9y)×8xy
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Step-by-step explanation:
(25x²-81y²)16x²y²/(5x-9y)×8xy
=(25x²-81y²)2xy/5x-9y
=[(5x)²-(9y)²]2xy/5x-9y
=[(5x+9y)(5x-9y)]2xy/5x-9y
=(5x+9y)2xy
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