神马品牌网作文日记的格式怎么写:两道初二因式分解题及其他
来源：百度文库 编辑：神马品牌网 时间：2024/04/28 05:49:00
因式分解:
1 x^(n+5)+9x^(n+3)-162x^(n+1)
2 (x^2+5x+6)(x^2+5x-2)+16
其他:
3 (-2)^99+(-2)^100=2^n, 求n.
4 化简 84a^2 b^3 c^4 d^2
----------------- =______ ;
-96c^2 d^3 b^5 a
2xy-x^2-y^2+z^2
--------------- =______
2xz+x^2-y^2+z^2
a^2 a^3-1
5 计算:(-a^2+ --- -a-1)* -----
a-1 a^2+a+1
1 x^(n+5)+9x^(n+3)-162x^(n+1)
2 (x^2+5x+6)(x^2+5x-2)+16
其他:
3 (-2)^99+(-2)^100=2^n, 求n.
4 化简 84a^2 b^3 c^4 d^2
----------------- =______ ;
-96c^2 d^3 b^5 a
2xy-x^2-y^2+z^2
--------------- =______
2xz+x^2-y^2+z^2
a^2 a^3-1
5 计算:(-a^2+ --- -a-1)* -----
a-1 a^2+a+1
1.
x^(n+5)+9x^(n+3)-162x^(n+1)
=x^(n+1)(x^4+9x²-162)
=x^(n+1)(x²+18)(x²-9)
=x^(n+1)(x²+18)(x+3)(x-3)
2.
(x²+5x+6)(x²+5x-2)+16
=(x²+5x+2+4)(x²+5x+2-4)+16
=(x²+5x+2)²-16+16
=(x²+5x+2)²
3.
2^n=(-2)^99+(-2)^100
=2^100-2^99
=2^99*(2-1)=2^99，
故n=99。
4.
(84a²b³c^4 d²)/(-96c²d³b^5 a )
=-(7ac²)/(8b²d)
(2xy-x²-y²+z²)/(2xz+x²-y²+z²)
=[z²-(x-y)²]/[(x+z)²-y²]
=[(x-y+z)(-x+y+z)]/[(x-y+z)(x+y+z)]
=(y+z-x)/(x+y+z)
5.
[-a²+a²/(a-1)-a-1]*(a³-1)/(a²+a+1)
=a²*(a³-1)/[(a²+a+1)(a-1)]+(-a²-a-1)*(a³-1)/(a²+a+1)
=a²-(a³-1)
= -a³+a²+1
这题你才给10分 要是给1000分我还有兴趣帮你做做!