因式分解:25(x+y)²-9(x-y)²;(x+y)²-4(x+y-1).
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因式分解:25(x+y)²-9(x-y)²;(x+y)²-4(x+y-1).
25(x+y)²-9(x-y)²
=[5(x+y)-3(x-y)][5(x+y)+3(x-y)]
=(2x+8y)(8x+2y)
=4(x+4y)(4x+y)
(x+y)²-4(x+y-1).
=(x+y)²-4(x+y)+4
=(x+y-2)^2
再问: 还有几题:a²-x²-2x-2a;1-m²-n²+2mn;x的4次方-5x²+4 不好意思啊,麻烦你了。。。
再答: a²-x²-2x-2a =(a-x)(a+x)-2(x+a) =(a-x-2)(a+x) 1-m²-n²+2mn =1-(m-n)^2 =(1-m+n)(1+m-n) x^4-5x^2+4 =(x^2-1)(x^2-4) =(x-1)(x+1)(x-2)(x+2) 先采纳后求助哦
=[5(x+y)-3(x-y)][5(x+y)+3(x-y)]
=(2x+8y)(8x+2y)
=4(x+4y)(4x+y)
(x+y)²-4(x+y-1).
=(x+y)²-4(x+y)+4
=(x+y-2)^2
再问: 还有几题:a²-x²-2x-2a;1-m²-n²+2mn;x的4次方-5x²+4 不好意思啊,麻烦你了。。。
再答: a²-x²-2x-2a =(a-x)(a+x)-2(x+a) =(a-x-2)(a+x) 1-m²-n²+2mn =1-(m-n)^2 =(1-m+n)(1+m-n) x^4-5x^2+4 =(x^2-1)(x^2-4) =(x-1)(x+1)(x-2)(x+2) 先采纳后求助哦
因式分解:25(x+y)²-9(x-y)²;(x+y)²-4(x+y-1).
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