答案太多,任意两个整式做差都能进行因式分解,都利用平法差公式:a*2-b*2=(a+b)(a-b).
这里给出四个答案做例子,方法都一样
⒈ (x+y)*2-1
= (x+y)*2-1*2
=(x+y+1)(x+y-1)
⒉4a*2-9b*2
=(2a)*2-(3b)*2
=(2a+3b)(2a-3b)
⒊ 4a*2-(x+y)*2
=(2a)*2-(x+y)*2
=(2a+x+y)(2a-x-y)
⒋ 9b*2-(x+y)*2
=(3b)*2-(x+y)*2
=(3b+x+y)(3b-x-y)