题目内容
(
×
+
)÷
.
| 5 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
(
×
+
)÷
=(
+1)×
÷
=
×
×
=
×(
×
)
=1
×1
=1
.
| 5 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
=(
| 5 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
=
| 12 |
| 7 |
| 4 |
| 7 |
| 7 |
| 4 |
=
| 12 |
| 7 |
| 4 |
| 7 |
| 7 |
| 4 |
=1
| 5 |
| 7 |
=1
| 5 |
| 7 |
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