(a-4b)(0.25a²+4b²+ab)
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![(a-4b)(0.25a²+4b²+ab)](/uploads/image/z/10151806-22-6.jpg?t=%28a-4b%29%280.25a%26%23178%3B%2B4b%26%23178%3B%2Bab%29)
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(a-4b)(0.25a²+4b²+ab)
(a-4b)(0.25a²+4b²+ab)
(a-4b)(0.25a²+4b²+ab)
原式=0.25(a--4b)(a^2+4ab+16b^2)
=0.25(a^3--64b^3)
=0.25a^3--16b^3.
(a-4b)(0.25a²+4b²+ab)
=a³+4ab²+a²b-a²b-16b³-4ab²
=a³-16b³