a²(a-b)²-b²(a+b)²等于多少
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a²(a-b)²-b²(a+b)²等于多少
a²(a-b)²-b²(a+b)²等于多少
a²(a-b)²-b²(a+b)²等于多少
a²(a-b)²-b²(a+b)²
=[a(a-b)]²-[b(a+b)]²
=[a(a-b)-b(a+b)][a(a-b)+b(a+b)]
=(a²-2ab-b²)(a²+b²)
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