题目内容
怎样简便怎样算
①3÷
-
÷3
②
÷[
×(
+
)]
③5.7-(1.9-1.3)
①3÷
| 3 |
| 7 |
| 3 |
| 7 |
②
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 3 |
| 4 |
| 5 |
③5.7-(1.9-1.3)
①3÷
-
÷3,
=3×
-
×
,
=7-
,
=6
;
②
÷[
×(
+
)],
=
÷[
×
],
=
×2×
,
=
:
③5.7-(1.9-1.3),
=5.7-1.9+1.3,
=(5.7+1.3)-1.9,
=7-1.9,
=5.1.
| 3 |
| 7 |
| 3 |
| 7 |
=3×
| 7 |
| 3 |
| 3 |
| 7 |
| 1 |
| 3 |
=7-
| 1 |
| 7 |
=6
| 6 |
| 7 |
②
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 3 |
| 4 |
| 5 |
=
| 9 |
| 20 |
| 1 |
| 2 |
| 22 |
| 15 |
=
| 9 |
| 20 |
| 15 |
| 22 |
=
| 27 |
| 44 |
③5.7-(1.9-1.3),
=5.7-1.9+1.3,
=(5.7+1.3)-1.9,
=7-1.9,
=5.1.
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