题目内容
(
+0.4)÷(1-
).
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(
+0.4)÷(1-
),
=(
+
)÷
,
=
×
,
=1
.
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| 20 |
=(
| 1 |
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| 2 |
| 5 |
| 11 |
| 20 |
=
| 11 |
| 15 |
| 20 |
| 11 |
=1
| 1 |
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