题目内容
奇思妙算(用简便方法计算下面各题)
(1)
×
×
-
(2)
÷2
+
×
(3)(
×13-
)÷
.
(1)
| 7 |
| 8 |
| 5 |
| 6 |
| 8 |
| 7 |
| 1 |
| 3 |
(2)
| 7 |
| 9 |
| 1 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
(3)(
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 3 |
(1)
×
×
-
=(
×
)×
-
=1×
-
=
-
=
(2)
÷2
+
×
=
×
+
×
=(
+
)×
=1×
=
(3))(
×13-
)÷
=(13-1)×
×3
=12×
×3
=8
| 7 |
| 8 |
| 5 |
| 6 |
| 8 |
| 7 |
| 1 |
| 3 |
=(
| 7 |
| 8 |
| 8 |
| 7 |
| 5 |
| 6 |
| 1 |
| 3 |
=1×
| 5 |
| 6 |
| 1 |
| 3 |
=
| 5 |
| 6 |
| 1 |
| 3 |
=
| 1 |
| 2 |
(2)
| 7 |
| 9 |
| 1 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
(3))(
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 3 |
=(13-1)×
| 2 |
| 9 |
=12×
| 2 |
| 9 |
=8
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