题目内容
| 看谁算得准(能简算要简算). (
|
| 41×9.9+4.1. |
(1)(
+
)×8,
=
×8+
×8,
=5+
,
=5
;
(2)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
×
,
=
;
(3)41×9.9+4.1,
=4.1×99+4.1,
=(99+1)×4.1,
=100×4.1,
=410.
| 5 |
| 8 |
| 2 |
| 27 |
=
| 5 |
| 8 |
| 2 |
| 27 |
=5+
| 16 |
| 27 |
=5
| 16 |
| 27 |
(2)
| 9 |
| 20 |
| 3 |
| 2 |
| 2 |
| 5 |
| 4 |
| 5 |
=
| 9 |
| 20 |
| 3 |
| 2 |
| 6 |
| 5 |
=
| 9 |
| 20 |
| 9 |
| 5 |
=
| 9 |
| 20 |
| 5 |
| 9 |
=
| 1 |
| 4 |
(3)41×9.9+4.1,
=4.1×99+4.1,
=(99+1)×4.1,
=100×4.1,
=410.
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