奖下列各式因式分解,①(4a+5b)²-(5a-4b)²①(4a+5b)²-(5a-4b)²②a²x²4a²xy+4a²y².
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奖下列各式因式分解,①(4a+5b)²-(5a-4b)²①(4a+5b)²-(5a-4b)²②a²x²4a²xy+4a²y².
奖下列各式因式分解,①(4a+5b)²-(5a-4b)²
①(4a+5b)²-(5a-4b)²
②a²x²4a²xy+4a²y².
奖下列各式因式分解,①(4a+5b)²-(5a-4b)²①(4a+5b)²-(5a-4b)²②a²x²4a²xy+4a²y².
(1)(4a+5b)²-(5a-4b)²
=(4a+5b+5a-4b)(4a+5b-5a+4b)
=(9a+b)(9b-a)
(2)a²x²+4a²xy+4a²y²
=a²(x²+4xy+4y²)
=a²(x+2y)²
或a²x²-4a²xy+4a²y²
=a²(x²-4xy+4y²)
=a²(x-2y)²