计算①(a+b)(a^2-ab+b^2)-(a-b)(a^2b^2) ②(x^n-3)(x^n+5) ③ (2x+5)(﹣3x+1)
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计算①(a+b)(a^2-ab+b^2)-(a-b)(a^2b^2) ②(x^n-3)(x^n+5) ③ (2x+5)(﹣3x+1)
计算①(a+b)(a^2-ab+b^2)-(a-b)(a^2b^2) ②(x^n-3)(x^n+5) ③ (2x+5)(﹣3x+1)
计算①(a+b)(a^2-ab+b^2)-(a-b)(a^2b^2) ②(x^n-3)(x^n+5) ③ (2x+5)(﹣3x+1)
(1)(a+b)(a^2--ab+b^2)--(a--b)(a^2b^2)
=a^3+b^3--a^3b^2+a^2b^3.
(2)(x^n--3)(x^n+5)
=x^2n+2x^n--15.
(3)(2x+5)((--3x+1)
=--6x^2--13x+5.