题目内容
用递等式计算:
①
-
+
②
+(
+
) ③7-(
-
)
①
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 3 |
| 23 |
| 28 |
| 13 |
| 14 |
| 2 |
| 7 |
| 3 |
| 4 |
| 2 |
| 5 |
(1)
-
+
=
+
,
=
;
(2)
+(
+
)
=
+
,
=
;
(3)7-(
-
)
=7-
,
=6
.
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 3 |
=
| 7 |
| 12 |
| 1 |
| 3 |
=
| 11 |
| 12 |
(2)
| 23 |
| 28 |
| 13 |
| 14 |
| 2 |
| 7 |
=
| 23 |
| 28 |
| 17 |
| 14 |
=
| 57 |
| 28 |
(3)7-(
| 3 |
| 4 |
| 2 |
| 5 |
=7-
| 7 |
| 20 |
=6
| 13 |
| 20 |
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