题目内容
| 计算下面各题. 42÷(
| (
|
| ||||||||||||||||
12×(
|
| 9×
|
(1)42÷(
÷
),
=42÷
,
=15;
(2)(
-
)÷
,
=
÷
,
=
;
(3)
×
+
÷3,
=
×(
+
),
=
×1,
=
;
(4)12×(
÷
),
=12×
,
=56;
(5)
×7+
×7,
=(
+
)×7,
=1×7,
=7;
(6)9×
÷9×
,
=1÷9×
,
=
×
,
=
.
| 6 |
| 5 |
| 3 |
| 7 |
=42÷
| 14 |
| 5 |
=15;
(2)(
| 1 |
| 2 |
| 3 |
| 8 |
| 3 |
| 4 |
=
| 1 |
| 8 |
| 3 |
| 4 |
=
| 1 |
| 6 |
(3)
| 3 |
| 7 |
| 2 |
| 3 |
| 3 |
| 7 |
=
| 3 |
| 7 |
| 2 |
| 3 |
| 1 |
| 3 |
=
| 3 |
| 7 |
=
| 3 |
| 7 |
(4)12×(
| 7 |
| 5 |
| 3 |
| 10 |
=12×
| 14 |
| 3 |
=56;
(5)
| 8 |
| 9 |
| 1 |
| 9 |
=(
| 8 |
| 9 |
| 1 |
| 9 |
=1×7,
=7;
(6)9×
| 1 |
| 9 |
| 1 |
| 9 |
=1÷9×
| 1 |
| 9 |
=
| 1 |
| 9 |
| 1 |
| 9 |
=
| 1 |
| 81 |
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