(a-2b)²(a+2b)²
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(a-2b)²(a+2b)²
(a-2b)²(a+2b)²
(a-2b)²(a+2b)²
原式=[(a-2b)(a+2b)]²
=(a²-4b²)
=a⁴-8a²b²+16b⁴
=[(a-2b)(a+2b)]^2
=(a^2-4b^2)^2
=a^4-8a^2b^2+16b^4
原式=[(a-2b)(a+2b)]^2
=[a^2-4b^2]^2
=a^4+16b^4-8a^2b^2
把平方都提出来,用平方差公式=(a方-4b方)平方