题目内容
| 7 |
| 9 |
| 3 |
| 4 |
(
| 13 |
| 14 |
| 5 |
| 7 |
| 13 |
| 14 |
1÷(
| 2 |
| 5 |
| 2 |
| 3 |
(1)
÷21×
,
=
×
,
=
;
(2)(
+
)÷
,
=
×
+
×
,
=1+
,
=1
;
(3)1÷(
+2.1×
),
=1÷(
+1.4),
=1÷1.8,
=
.
| 7 |
| 9 |
| 3 |
| 4 |
=
| 1 |
| 27 |
| 3 |
| 4 |
=
| 1 |
| 36 |
(2)(
| 13 |
| 14 |
| 5 |
| 7 |
| 13 |
| 14 |
=
| 13 |
| 14 |
| 14 |
| 13 |
| 5 |
| 7 |
| 14 |
| 13 |
=1+
| 10 |
| 13 |
=1
| 10 |
| 13 |
(3)1÷(
| 2 |
| 5 |
| 2 |
| 3 |
=1÷(
| 2 |
| 5 |
=1÷1.8,
=
| 5 |
| 9 |
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