2
1 14 434
(2) 0.25 8 3 6.5 2 6 2
3 13 3
(3)(-3)3÷
9411
×+()2007×(-4)2008-22×(-) 4943
1111(4)
1 (1 )(1 )(1 )(1 )(1 )(1 )(1 ) (1 )223234232010
14.已知13 1 12 22;13 23 9 1 22 32;
4
4
(1)猜想填空: (2)计算①
②23+43+63+983+……+1003
15.已知x1 1 x2 2 x3 3 x2002 2002 x2003 2003 0,