题目内容
2004×
| (
|
|
(1)2004×
=(2003+1)×
=2003×
+1×
=2002+
=2002
;
(2)(
+
)×15×17
=(
+
)×(15×17)
=
×15×17+
×17×15
=17+30
=47;
(3)
+
+
+…+
=1-
+
-
+
-
+…+
-
=1-
=
.
2002 |
2003 |
=(2003+1)×
2002 |
2003 |
=2003×
2002 |
2003 |
2002 |
2003 |
=2002+
2002 |
2003 |
=2002
2002 |
2003 |
(2)(
1 |
15 |
2 |
17 |
=(
1 |
15 |
2 |
17 |
=
1 |
15 |
2 |
17 |
=17+30
=47;
(3)
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
99×100 |
=1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
99 |
1 |
100 |
=1-
1 |
100 |
=
99 |
100 |
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