题目内容
(
+
-
)×4×9.
| 1 |
| 6 |
| 1 |
| 9 |
| 1 |
| 12 |
(
+
-
)×4×9,
=(
+
-
)×(4×9),
=(
+
-
)×36,
=
×36+
×36-
×36,
=6+4-3,
=10-3,
=7.
| 1 |
| 6 |
| 1 |
| 9 |
| 1 |
| 12 |
=(
| 1 |
| 6 |
| 1 |
| 9 |
| 1 |
| 12 |
=(
| 1 |
| 6 |
| 1 |
| 9 |
| 1 |
| 12 |
=
| 1 |
| 6 |
| 1 |
| 9 |
| 1 |
| 12 |
=6+4-3,
=10-3,
=7.
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