一、计算 (1)x^2(x^2-x-1)-x(x^2-3x) (2) (2m+3)(m-2)-(1-2m)(3-m) (3) (1-a)(1+a^2)(1+a)(1+a^4)
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![一、计算 (1)x^2(x^2-x-1)-x(x^2-3x) (2) (2m+3)(m-2)-(1-2m)(3-m) (3) (1-a)(1+a^2)(1+a)(1+a^4)](/uploads/image/z/5178150-54-0.jpg?t=%E4%B8%80%E3%80%81%E8%AE%A1%E7%AE%97+%EF%BC%881%EF%BC%89x%5E2%28x%5E2-x-1%29-x%28x%5E2-3x%29+%EF%BC%882%EF%BC%89+%282m%2B3%29%28m-2%29-%281-2m%29%283-m%29+%283%29+%EF%BC%881-a%29%281%2Ba%5E2%29%281%2Ba%29%281%2Ba%5E4%29)
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一、计算 (1)x^2(x^2-x-1)-x(x^2-3x) (2) (2m+3)(m-2)-(1-2m)(3-m) (3) (1-a)(1+a^2)(1+a)(1+a^4)
一、计算 (1)x^2(x^2-x-1)-x(x^2-3x) (2) (2m+3)(m-2)-(1-2m)(3-m) (3) (1-a)(1+a^2)(1+a)(1+a^4)
一、计算 (1)x^2(x^2-x-1)-x(x^2-3x) (2) (2m+3)(m-2)-(1-2m)(3-m) (3) (1-a)(1+a^2)(1+a)(1+a^4)
(1)原式=x^4-x^3-x^2-x^3+3x^2
=x^4-2x^3-2x^2
(2)原式=2m^2-4m+3m-6-3+m+6m-2m^2
=6m-9
(3)原式=(1-a)(1+a)(1+a^2)(1+a^4)
=(1-a^2)(1+a^2)(1+a^4)
=(1-a^4)(1+a^4)
=(1-a^8)
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