x²-4xy-1+4y² 因式分解
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x²-4xy-1+4y² 因式分解
还有一题:2×56²+8×56×22+2×44² 简便运算
还有一题:2×56²+8×56×22+2×44² 简便运算
![x²-4xy-1+4y² 因式分解](/uploads/image/z/19332106-34-6.jpg?t=x%26%23178%3B-4xy-1%2B4y%26%23178%3B+%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3)
x²-4xy-1+4y²
=x²-4xy+4y² -1
=(x-2y)²-1
=(x-2y+1)(x-2y-1)
:2×56²+8×56×22+2×44²
=2(56²+2×56×44+44²)
=2(56+44)²
=2×100²
=20000
=x²-4xy+4y² -1
=(x-2y)²-1
=(x-2y+1)(x-2y-1)
:2×56²+8×56×22+2×44²
=2(56²+2×56×44+44²)
=2(56+44)²
=2×100²
=20000