(a+3b)²-(2a-b)².因式分解(a+3b)²-(2a-b)²
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(a+3b)²-(2a-b)².因式分解(a+3b)²-(2a-b)²
(a+3b)²-(2a-b)².
因式分解(a+3b)²-(2a-b)²
(a+3b)²-(2a-b)².因式分解(a+3b)²-(2a-b)²
平方差公式
(a+3b+2a-b)(a+3b-2a+b)
=(3a+2b)(4b-a)