题目内容
2008
|
|
(3)2668
×
=(2668+
)×
=2668×
+
×
=3+
=3
;
(2)
+
+
+…+
=
×(
-
+
-
+…+
-
)
=
×(
-
)
=
×
=
.
2668 |
2669 |
3 |
2668 |
=(2668+
2668 |
2669 |
3 |
2668 |
=2668×
3 |
2668 |
2668 |
2669 |
3 |
2668 |
=3+
3 |
2669 |
=3
3 |
2669 |
(2)
3 |
7×9 |
3 |
9×33 |
3 |
33×33 |
3 |
39×23 |
=
3 |
2 |
3 |
7 |
3 |
9 |
3 |
9 |
3 |
33 |
3 |
39 |
3 |
23 |
=
3 |
2 |
3 |
7 |
3 |
23 |
=
3 |
2 |
2 |
23 |
=
3 |
23 |
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