几道因式分解,过程需详细~~
(1)4a^2-20ab+25b^2-36(2)x^6-y^6-2x^3+1(3)a^4b+a^3b^2-a^2b^3-ab^4a^2相当于a的2次方~~x^2-6x-5...
(1)4a^2-20ab+25b^2-36
(2)x^6-y^6-2x^3+1
(3) a^4b+a^3b^2-a^2b^3-ab^4
a^2相当于a的2次方~~
x^2-6x-5 展开
(2)x^6-y^6-2x^3+1
(3) a^4b+a^3b^2-a^2b^3-ab^4
a^2相当于a的2次方~~
x^2-6x-5 展开
2010-09-03
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(1)4a^2-20ab+25b^2-36
=(2a-5b)²-36
=(2a-5b+6)(2a-5b-6)
(2)x^6-y^6-2x^3+1
=(x³悔誉-1)²-y^6
=(x³毁前祥-1-y³)(x³-1+y³)
(3) a^4b+a^3b^2-a^2b^3-ab^4
=ab(a³+a²b-ab²-b³)
=ab[a²(a+b)-b²纤搏(a+b)]
=ab(a²-b²)(a+b)
=ab(a-b)(a+b)²
=(2a-5b)²-36
=(2a-5b+6)(2a-5b-6)
(2)x^6-y^6-2x^3+1
=(x³悔誉-1)²-y^6
=(x³毁前祥-1-y³)(x³-1+y³)
(3) a^4b+a^3b^2-a^2b^3-ab^4
=ab(a³+a²b-ab²-b³)
=ab[a²(a+b)-b²纤搏(a+b)]
=ab(a²-b²)(a+b)
=ab(a-b)(a+b)²
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(1)4a^2-20ab+25b^2-36
=(2a-5b)^2-6^2
=(2a-5b+6)*(2a-5b-6)
(2)x^6-y^6-2x^3+1
=(x^3-1)^2-(y^3)^2
=(x^3-1+y^3)*(x^3-1-y^3)
(3) a^4b+a^3b^2-a^2b^3-ab^4
=ab(a^3+a^2b-ab^2-b^3)
=ab(a(a^2-b^2)+b(a^2-b^2))
=ab(a+b)(a^2-b^2)
=ab(a+b)(a+b)(a-b)
=ab(a+b)^2(a-b)
=(2a-5b)^2-6^2
=(2a-5b+6)*(2a-5b-6)
(2)x^6-y^6-2x^3+1
=(x^3-1)^2-(y^3)^2
=(x^3-1+y^3)*(x^3-1-y^3)
(3) a^4b+a^3b^2-a^2b^3-ab^4
=ab(a^3+a^2b-ab^2-b^3)
=ab(a(a^2-b^2)+b(a^2-b^2))
=ab(a+b)(a^2-b^2)
=ab(a+b)(a+b)(a-b)
=ab(a+b)^2(a-b)
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(孙侍枣1)则拆谈答。4a^2-20ab+25b^2-36=(2a-5b)^2-36=(2a-5b+6)*(2a-5b-6)
(2).x^6-y^6-2x^3+1=(x^3-1)^2-y^6=(x^3+y^3-1)*(x^3-y^3-1)
(3).a^4b+a^3b^2-a^2b^3-ab^4=a^2b(a^2-b^2)+ab^2(a^2-b^2)=ab(a+b)*(a+b)*(a-b)
(2).x^6-y^6-2x^3+1=(x^3-1)^2-y^6=(x^3+y^3-1)*(x^3-y^3-1)
(3).a^4b+a^3b^2-a^2b^3-ab^4=a^2b(a^2-b^2)+ab^2(a^2-b^2)=ab(a+b)*(a+b)*(a-b)
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