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             2531     2007-12-21
 

1111 8 32/5 8888 6.4

5. 2000-1 + 1999-2 + 1998-3 + + 1002-999 + 1001-1000 =

1999 1997 1995 3 1 1 2000 2000 1000 1+1999=3+1997=5+1995= =2000 1000 2

2000-1 + 1999-2 + 1998-3 +

+ 1002-999 + 1001-1000

=1999+1997+1995+ +3+1

= 1+1999 1000 2

=2000 500

=1000000

9 3/4 8/9 99/100

894 124 123 894 894 124 894 123+894

1+2+3+ +1998+1999+1998+ +3+2+1

8

1 2 4+ 1 2 2 2 4 2 + + 1 1998 2 1998 4 1998 1 2 4 1+2 2 2+ +1998 1998 1998 1 3 9 1+2 2 2+ +1998 1998 1998

13.1994+1993-1992-1991+1990+1989-1988-1987+ +10+9-8-7+6+5-4-3+2+1=

4 4 1994 4=498 2 2 2+1=3

1994+1993-1992-1991+1990+1989-1988-1987+ +10+9-8-7+6+5-4-3+2+1

=4 1994 2 + 2+1

=4 498+3

=1992+3

=1995

41 1

1 1 2 2 3 3 4 6 7

1

a b

1995 1.6 2 0.8

=1 0.8

=1.25

19.1 2 3 4 5 99 100 0

2 5=10 2 5 0 100 2 5 100 2 5 5 0

100 5 5 10 15 95 100 20 25 50 75 100 25 5 5 20+4=24 24 0


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