题目内容
脱式计算:
①12
+
×1
②(2.9+3.1)×3
-2
③2
×
-
÷1
.
①12
| 1 |
| 4 |
| 3 |
| 5 |
| 1 |
| 4 |
②(2.9+3.1)×3
| 1 |
| 3 |
| 5 |
| 7 |
③2
| 1 |
| 5 |
| 5 |
| 7 |
| 5 |
| 7 |
| 2 |
| 3 |
①12
+
×1
=12
+
×
,
=12
+
,
=13;
②(2.9+3.1)×3
-2
=6×
-2
,
=20-2
,
=17
;
③2
×
-
÷1
.
=2
×
-
×
,
=(
-
)×
,
=
×
,
=
.
| 1 |
| 4 |
| 3 |
| 5 |
| 1 |
| 4 |
=12
| 1 |
| 4 |
| 3 |
| 5 |
| 5 |
| 4 |
=12
| 1 |
| 4 |
| 3 |
| 4 |
=13;
②(2.9+3.1)×3
| 1 |
| 3 |
| 5 |
| 7 |
=6×
| 10 |
| 3 |
| 5 |
| 7 |
=20-2
| 5 |
| 7 |
=17
| 2 |
| 7 |
③2
| 1 |
| 5 |
| 5 |
| 7 |
| 5 |
| 7 |
| 2 |
| 3 |
=2
| 1 |
| 5 |
| 5 |
| 7 |
| 5 |
| 7 |
| 3 |
| 5 |
=(
| 11 |
| 5 |
| 3 |
| 5 |
| 5 |
| 7 |
=
| 8 |
| 5 |
| 5 |
| 7 |
=
| 8 |
| 7 |
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