把下列各式分解因式a²-81=?36-a²=?1-16b²=?m²-9n²=?
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![把下列各式分解因式a²-81=?36-a²=?1-16b²=?m²-9n²=?](/uploads/image/z/11528008-16-8.jpg?t=%E6%8A%8A%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8Fa%26%23178%3B-81%3D%3F36-a%26%23178%3B%3D%3F1-16b%26%23178%3B%3D%3Fm%26%23178%3B-9n%26%23178%3B%3D%3F)
把下列各式分解因式a²-81=?36-a²=?1-16b²=?m²-9n²=?
把下列各式分解因式a²-81=?36-a²=?1-16b²=?m²-9n²=?
把下列各式分解因式a²-81=?36-a²=?1-16b²=?m²-9n²=?
解
a²-81
=a²-9²
=(a-9)(a+9)
36-a²
=6²-a²
=(6-a)(6+a)
1-16b²
=1²-(4b)²
=(1+4b)(1-4b)
m²-9n²
=m²-(3n)²
=(m+3n)(m-3n)