【分解因式】x²-4 x²-9y² x²y²-4 4m²-1【分解因式】x²-4x²-9y²x²y²-44m²-1m²-16n²4分之49a²-x²y²
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![【分解因式】x²-4 x²-9y² x²y²-4 4m²-1【分解因式】x²-4x²-9y²x²y²-44m²-1m²-16n²4分之49a²-x²y²](/uploads/image/z/2770257-57-7.jpg?t=%E3%80%90%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%E3%80%91x%26%23178%3B-4+x%26%23178%3B-9y%26%23178%3B+x%26%23178%3By%26%23178%3B-4+4m%26%23178%3B-1%E3%80%90%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%E3%80%91x%26%23178%3B-4x%26%23178%3B-9y%26%23178%3Bx%26%23178%3By%26%23178%3B-44m%26%23178%3B-1m%26%23178%3B-16n%26%23178%3B4%E5%88%86%E4%B9%8B49a%26%23178%3B-x%26%23178%3By%26%23178%3B)
【分解因式】x²-4 x²-9y² x²y²-4 4m²-1【分解因式】x²-4x²-9y²x²y²-44m²-1m²-16n²4分之49a²-x²y²
【分解因式】x²-4 x²-9y² x²y²-4 4m²-1
【分解因式】
x²-4
x²-9y²
x²y²-4
4m²-1
m²-16n²
4分之49a²-x²y²
【分解因式】x²-4 x²-9y² x²y²-4 4m²-1【分解因式】x²-4x²-9y²x²y²-44m²-1m²-16n²4分之49a²-x²y²
全是平方差公式的应用:a² - b² = (a+b)(a-b)
x²-4 = (x+2)(x-2)
x²-9y² = (x+3y)(x-3y)
x²y²-4 = (xy +2)(xy-2)
4m²-1 = (2m+1)(2m-1)
m²-16n² = (m -4n)(m+4n)
4分之49a²-x²y² = (2分之7a + xy)(2分之7a - xy)
x²-4
=(x+2)(x-2)
x²-9y²
=(x+3y)(x-3y)
x²y²-4
=(xy+2)(xy-2)
4m²-1
(2m+1)(2m-1)
m²-16n²
=(m+4n)(m-4n)
4分之49a²-x²y²
=(2分之7a+xy)(2分之7a-xy)