约分a^2-4ab+4b^2/a^4-8a^2b^2+16b^4

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约分a^2-4ab+4b^2/a^4-8a^2b^2+16b^4约分a^2-4ab+4b^2/a^4-8a^2b^2+16b^4约分a^2-4ab+4b^2/a^4-8a^2b^2+16b^4a^2-

约分a^2-4ab+4b^2/a^4-8a^2b^2+16b^4
约分a^2-4ab+4b^2/a^4-8a^2b^2+16b^4

约分a^2-4ab+4b^2/a^4-8a^2b^2+16b^4
a^2-4ab+4b^2/a^4-8a^2b^2+16b^4
=(a-2b)²/(a²-4b²)²
=(a-2b)²/(a-2b)²/(a+2b)²
=1/(a+2b)²