题目内容
脱式计算
19÷[(
+
)÷
]
÷[1÷(
+
)].
19÷[(
| 3 |
| 4 |
| 1 |
| 5 |
| 1 |
| 2 |
| 5 |
| 7 |
| 2 |
| 3 |
| 1 |
| 5 |
(1)19÷[(
+
)÷
],
=19÷[
÷
],
=19÷
,
=10;
(2)
÷[1÷(
+
)],
=
÷[1÷
],
=
×
,
=
.
| 3 |
| 4 |
| 1 |
| 5 |
| 1 |
| 2 |
=19÷[
| 19 |
| 20 |
| 1 |
| 2 |
=19÷
| 19 |
| 10 |
=10;
(2)
| 5 |
| 7 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 5 |
| 7 |
| 13 |
| 15 |
=
| 5 |
| 7 |
| 13 |
| 15 |
=
| 13 |
| 21 |
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