(x+2y)^2(x^2-2xy+4y^2)^2=
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(x+2y)^2(x^2-2xy+4y^2)^2=
(x+2y)^2(x^2-2xy+4y^2)^2
=(x+2y)²(x-2y)²
=(x²-4y²)²
=x^4-8x²y²+16y^4
再问: 那(x^2-2xy+4y^2)^2算出不是应该是【(x-2y)²】^2吗
再答: (x+2y)^2(x^2-2xy+4y^2)^2 =(x+2y)²(x-2y)^4 是滴
再问: ?能清楚点吗?
再答: (x+2y)^2(x^2-2xy+4y^2)^2 =(x+2y)²【(x-2y)²】^2 =(x+2y)²(x-2y)^4
=(x+2y)²(x-2y)²
=(x²-4y²)²
=x^4-8x²y²+16y^4
再问: 那(x^2-2xy+4y^2)^2算出不是应该是【(x-2y)²】^2吗
再答: (x+2y)^2(x^2-2xy+4y^2)^2 =(x+2y)²(x-2y)^4 是滴
再问: ?能清楚点吗?
再答: (x+2y)^2(x^2-2xy+4y^2)^2 =(x+2y)²【(x-2y)²】^2 =(x+2y)²(x-2y)^4
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