4【a-b】²-【a+b】²=?
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4【a-b】²-【a+b】²=?
4【a-b】²-【a+b】²=?
4【a-b】²-【a+b】²=?
原式
=【2(a-b)】²-(a+b)²
=【2(a-b)+(a+b)】【2(a-b)-(a+b)】
=(3a-b)(a-3b)
4【a-b】²-【a+b】²
=[2(a-b)-(a+b)][2(a-b)+(a+b)]
=(a-3b)(3a-b)
(3a-b)乘以(a-3b)
原式=(a+b)(4a-4b-a-b)=(a+b)(3a-5b)
4【a-b】²-【a+b】²=【2(a-b)+(a+b)】【2(a-b)-(a+b)】=(2a-2b+a+b)(2a-2b-a-b)
=(3a-b)(a-3b)