题目内容
怎样简便就怎样算.
16×
|
|
|
(1)16×
×(9×
),
=16×
×9×
,
=(16×
)×(
×9),
=2×6,
=12;
(2)
+
×
,
=(1+
)×
,
=
×
,
=
;
(3)
×[
-(
-
)],
=
×[
-
+
],
=
×[(
+
)-
],
=
×[1-
],
=
×
,
=
;
| 2 |
| 3 |
| 1 |
| 8 |
=16×
| 2 |
| 3 |
| 1 |
| 8 |
=(16×
| 1 |
| 8 |
| 2 |
| 3 |
=2×6,
=12;
(2)
| 1 |
| 4 |
| 37 |
| 7 |
| 1 |
| 4 |
=(1+
| 37 |
| 7 |
| 1 |
| 4 |
=
| 44 |
| 7 |
| 1 |
| 4 |
=
| 11 |
| 7 |
(3)
| 4 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 4 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 4 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 16 |
=
| 4 |
| 9 |
| 7 |
| 16 |
=
| 4 |
| 9 |
| 9 |
| 16 |
=
| 1 |
| 4 |
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