求解数学题,需要过程哦,谢谢
因式分解:(x+4y)^2-2x-8y+1-a^2分解因式:4-x^2+2x^3-x^4分解因式:36m^2n^2-(m^2+9n^2-1)^2...
因式分解:(x+4y)^2-2x-8y+1-a^2
分解因式:4-x^2+2x^3-x^4
分解因式:36m^2n^2-(m^2+9n^2-1)^2 展开
分解因式:4-x^2+2x^3-x^4
分解因式:36m^2n^2-(m^2+9n^2-1)^2 展开
1个回答
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(1)(x+4y)^2-2x-8y+1-a^2=(x+4y)^2-2(x+4y)+1-a^2=(x+4y-1)^2-a^2=(x+4y-1+a)(x+4y-1-a)
(2)4-x^2+2x^3-x^4=4-x^2(1-2x+x^2)=4-x^2(x-1)^2=-(x^2-x-2)(x^2-x+2)=-(x+1)(x-2)(x^2-x+2)
(3)36m^2n^2-(m^2+9n^2-1)^2=(6mn+m^2+9n^2-1)(6mn-m^2-9n^2+1)=-[(m+3n)^2-1][(m-3n)^2-1]=-(m+3n+1)(m+3n-1)(m-3n+1)(m-3n-1)
(2)4-x^2+2x^3-x^4=4-x^2(1-2x+x^2)=4-x^2(x-1)^2=-(x^2-x-2)(x^2-x+2)=-(x+1)(x-2)(x^2-x+2)
(3)36m^2n^2-(m^2+9n^2-1)^2=(6mn+m^2+9n^2-1)(6mn-m^2-9n^2+1)=-[(m+3n)^2-1][(m-3n)^2-1]=-(m+3n+1)(m+3n-1)(m-3n+1)(m-3n-1)
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