(1)2b²+(a+b)(a-b)-(a-b)²其中a=-3,b=1/2
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![(1)2b²+(a+b)(a-b)-(a-b)²其中a=-3,b=1/2](/uploads/image/z/2590532-44-2.jpg?t=%EF%BC%881%EF%BC%892b%26%23178%3B%2B%EF%BC%88a%2Bb%29%EF%BC%88a-b%29-%EF%BC%88a-b%29%26%23178%3B%E5%85%B6%E4%B8%ADa%EF%BC%9D-3%2Cb%EF%BC%9D1%2F2)
(1)2b²+(a+b)(a-b)-(a-b)²其中a=-3,b=1/2
(1)2b²+(a+b)(a-b)-(a-b)²其中a=-3,b=1/2
(1)2b²+(a+b)(a-b)-(a-b)²其中a=-3,b=1/2
2b²+(a+b)(a-b)-(a-b)²=2b²+a²-b²-(a²-2ab+b²)=2ab=2×(-3)×(1/2)=-3