Question

计算：1.(-2x-7y)^2 2.(-4x-3y)(4x-3y) 3.(-1/2a+2b)(1/2a-2b) 4.(a/3+3)^2+(a/3-3)^2 5.(-x-y-1)(x-y-1)

简便运算
1.103×97-104^2
2.2012^2-2013×2011
求答案啊~还要解题过程，很急啊~

Answer 1

1.(-2x-7y)^2 =4x²+28xy+49y²

2.(-4x-3y)(4x-3y)
=9y²-16x²
3.(-1/2a+2b)(1/2a-2b)
=-（1/2a-2b）²
=-1/4a²+2ab-4b²
4.(a/3+3)^2+(a/3-3)^2
=a²/9+2a+9+a²/9-2a+9
=2a²/9+18
5.(-x-y-1)(x-y-1)

=(y+1+x)(y+1-x)
=(y+1)²-x²
=y²+2y+1-x²
1.103×97-104^2
=（100+3）（100-3）-104²
=100²-9-104²
=（100+104）（100-104）-9
=-4×204-9
=-816-9
=-825
2.2012^2-2013×2011
=2012²-（2012+1）（2012-1）
=2012²-2012²+1
=1