【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
网友回答
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)======以下答案可供参考======
供参考答案1:
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)