(a+3b)²-(3a+b)²

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(a+3b)²-(3a+b)²(a+3b)²-(3a+b)²(a+3b)²-(3a+b)²原式=[(a+3b)+(3a+b)][(a+3b)

(a+3b)²-(3a+b)²
(a+3b)²-(3a+b)²

(a+3b)²-(3a+b)²
原式=[(a+3b)+(3a+b)][(a+3b)-(3a+b)]
=(4a+4b)(-2a+2b)
=8(a+b)(b-a)