题目内容
递等式计算(能简便计算用简便计算):
4-
|
| 30.8÷[14-(9.85+1.07)]= |
|
(1)4-
-
,
=4-(
+
),
=4-1,
=3;
(2)
-(
-
),
=
-
+
,
=
;
(3)30.8÷[14-(9.85+1.07)],
=30.8÷[14-10.92],
=30.8÷3.08,
=10;
(4)
+
-
,
=
+(
-
),
=
+
,
=
.
| 9 |
| 17 |
| 8 |
| 17 |
=4-(
| 9 |
| 17 |
| 8 |
| 17 |
=4-1,
=3;
(2)
| 9 |
| 13 |
| 9 |
| 13 |
| 2 |
| 11 |
=
| 9 |
| 13 |
| 9 |
| 13 |
| 2 |
| 11 |
=
| 2 |
| 11 |
(3)30.8÷[14-(9.85+1.07)],
=30.8÷[14-10.92],
=30.8÷3.08,
=10;
(4)
| 5 |
| 6 |
| 3 |
| 8 |
| 1 |
| 8 |
=
| 5 |
| 6 |
| 3 |
| 8 |
| 1 |
| 8 |
=
| 5 |
| 6 |
| 1 |
| 4 |
=
| 13 |
| 12 |
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