平方差公式计算题教学提纲.docx

文档介绍：平方差公式
.计算
(-2x2 5)(-2x2 -5)
(3) (-4a -1)(4a -1) (4
(5) (3a - 2b)(3a 2b)(9a2 4b2)
(7) (a+2) (a2+4) (a4+16) (a —2)
(平方差公式
.计算
(-2x2 5)(-2x2 -5)
(3) (-4a -1)(4a -1) (4
(5) (3a - 2b)(3a 2b)(9a2 4b2)
(7) (a+2) (a2+4) (a4+16) (a —2)
(9) 1998 2-1997 X 1999
2
(11) 2009X 2007-2008 2

(2) (ab 4)(ab - 4)
)(-1+3x) (-1-3x )
2 4
(6) (1 - a)(1 a)(1 a )(1 a )
(8) (x4 + 1)(x2+1)(x + 1)(x-1)
2
(10) 2003X 2001 — 20022
(12) 20112 - 2010 2012
(1)(3+ n)(-3+ n) - (3n -1)(-3n - 1)⑵
(m2 1)(m 1)(m -1) - (m4 1)
⑶(2x - 3y)(3y + 2x) - (4y - 3x)(3x + 4y)(4) a4+(1 —
a)(1+a)(1+a 2)
⑸-3(x + 1Xx-1)-(3x + 2X2-3x)⑹
(a 3)(a - 3) - (a -1)(a 4)
.先化简，再求值:
⑵(3m -4n)(4n+3m) —(2m +3n)(2m —n), 其中 m = 1,n = —1.