题目内容
简便计算.
| (
| 18.38+4.62-2.38. |
①
×
+
×
,
=
×(
+
),
=
×1,
=
;
②(
+
-
)×72,
=72×
+72×
-
×72,
=56+60-18,
=98;
③18.38+4.62-2.38,
=(18.38-2.38)+4.62,
=16+4.62,
=20.62.
| 15 |
| 28 |
| 5 |
| 8 |
| 5 |
| 8 |
| 13 |
| 28 |
=
| 5 |
| 8 |
| 15 |
| 28 |
| 13 |
| 28 |
=
| 5 |
| 8 |
=
| 5 |
| 8 |
②(
| 7 |
| 9 |
| 5 |
| 6 |
| 1 |
| 4 |
=72×
| 7 |
| 9 |
| 5 |
| 6 |
| 1 |
| 4 |
=56+60-18,
=98;
③18.38+4.62-2.38,
=(18.38-2.38)+4.62,
=16+4.62,
=20.62.
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