把下列因式分解:(1)(x+y)(x的平方+y的平方)(x-y)(x的4次方+y的4次方)(2)(m-n-3)的平方
(3)(a+b)的平方-(a-b)的平方(4)x的平方(x-y)+2x(x-y)-(y-x)(5)(x+2)(x+4)+1...
(3)(a+b)的平方-(a-b)的平方(4)x的平方(x-y)+2x(x-y)-(y-x)(5)(x+2)(x+4)+1
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(1)(x+y)(x的平方+y的平方)(x-y)(x的4次方+y的4次方)
=(x²-y²)(x²+y²)(x^4+y^4)
=(x^4-y^4)(x^4+y^4)
=x^8-y^8
(2)(m-n-3)的平方
=(m-n)²-6(m-n)+9
=m²-2mn+n²-6m+6n+9
(3)(a+b)的平方-(a-b)的平方
=(a+b+a-b)(a+b-a+b)
=4ab
(4)x的平方(x-y)+2x(x-y)-(y-x)
=(x-y)(x²+2x+1)
=(x-y)(x+1)²
(5)(x+2)(x+4)+1
=x²+6x+8+1
=x²+6x+9
=(x+3)²
=(x²-y²)(x²+y²)(x^4+y^4)
=(x^4-y^4)(x^4+y^4)
=x^8-y^8
(2)(m-n-3)的平方
=(m-n)²-6(m-n)+9
=m²-2mn+n²-6m+6n+9
(3)(a+b)的平方-(a-b)的平方
=(a+b+a-b)(a+b-a+b)
=4ab
(4)x的平方(x-y)+2x(x-y)-(y-x)
=(x-y)(x²+2x+1)
=(x-y)(x+1)²
(5)(x+2)(x+4)+1
=x²+6x+8+1
=x²+6x+9
=(x+3)²
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