a^4b+a^3b^2-a^2b^3-ab^4 求解答
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a^4b+a^3b^2-a^2b^3-ab^4 求解答
a^4b+a^3b^2-a^2b^3-ab^4 求解答
a^4b+a^3b^2-a^2b^3-ab^4 求解答
a^4 * b + a^3 * b^2 - a^2 * b^3 - a * b^4
= a^3 * b(a + b) - a * b^3(a + b)
= (a + b)(a^3 * b - a * b^3)
= ab(a + b)(a^2 - b^2)
= ab(a + b)(a + b)(a - b)
= ab(a - b)(a + b)^2
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