急求学霸帮忙,,,初一数学题
2个回答
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解:1.25x^4+10x^2+1
=(5x^2+1)^2
2.(a+b)^2-4
=(a+b+2)(a+b-2)
3.-18a^2b+12ab^2-2b^3
=-2b(9a^2-6ab+b)
=-2b(3a+b)^2
4.x^2+2xy-1+y^2
=(x+y)^2-1
=(x+y+1)(x+y-1)
5.(a^2+b^2)^2-4a^2b^2
=a^4+2a^2b^2+b^4-4a^2b^2
=(a^2-b^2)^2
=((a+b)(a-b))^2
6.x^2-5x-6
=(x+2)(x-3)
=(5x^2+1)^2
2.(a+b)^2-4
=(a+b+2)(a+b-2)
3.-18a^2b+12ab^2-2b^3
=-2b(9a^2-6ab+b)
=-2b(3a+b)^2
4.x^2+2xy-1+y^2
=(x+y)^2-1
=(x+y+1)(x+y-1)
5.(a^2+b^2)^2-4a^2b^2
=a^4+2a^2b^2+b^4-4a^2b^2
=(a^2-b^2)^2
=((a+b)(a-b))^2
6.x^2-5x-6
=(x+2)(x-3)
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