(a+2b-1)(a-2b+1)-(a+b)²(a-b)²
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(a+2b-1)(a-2b+1)-(a+b)²(a-b)²
(a+2b-1)(a-2b+1)-(a+b)²(a-b)²
(a+2b-1)(a-2b+1)-(a+b)²(a-b)²
原式=[a+(2b-1)][a-(2b-1)]-[(a+b)(a-b)]²
=a²-(2b-1)²-(a²-b²)²
=a²-4b²+4b-1-a⁴+2a²b²-b⁴