(a+b)²+2(a+b)(a-b)+(a-b)².其中a=2/1(二分之一),b=1
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![(a+b)²+2(a+b)(a-b)+(a-b)².其中a=2/1(二分之一),b=1](/uploads/image/z/1975243-67-3.jpg?t=%28a%2Bb%29%26%23178%3B%2B2%28a%2Bb%29%28a-b%29%2B%28a-b%29%26%23178%3B.%E5%85%B6%E4%B8%ADa%3D2%2F1%EF%BC%88%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%EF%BC%89%2Cb%3D1)
(a+b)²+2(a+b)(a-b)+(a-b)².其中a=2/1(二分之一),b=1
(a+b)²+2(a+b)(a-b)+(a-b)².其中a=2/1(二分之一),b=1
(a+b)²+2(a+b)(a-b)+(a-b)².其中a=2/1(二分之一),b=1
原式=a2+2ab+b2+2a2-2b2+a2-2ab+b2
=4a2
=4*(2/1)2
=1
(a+b)²+2(a+b)(a-b)+(a-b)²
=[(a+b)+(a-b)]²
=[a+b+a-b]²
=(2a)²
=(2×1/2)²
=1²
=1