题目内容
用递等式计算(怎样简便怎样算).
+
+
-
+
+0.6-
-(
-
).
1 |
5 |
3 |
8 |
4 |
5 |
8 |
9 |
2 |
3 |
1 |
3 |
17 |
19 |
17 |
19 |
5 |
8 |
5 |
8 |
1 |
2 |
(1)
+
+
,
=
+
+
,
=1+
,
=1
;
(2)
-
+
,
=
-(
-
),
=
-
,
=
;
(3)
+0.6-
,
=
-
+0.6,
=0+0.6,
=0.6;
(4)
-(
-
)
=
-
+
,
=0+
,
=
.
1 |
5 |
3 |
8 |
4 |
5 |
=
1 |
5 |
4 |
5 |
3 |
8 |
=1+
3 |
8 |
=1
3 |
8 |
(2)
8 |
9 |
2 |
3 |
1 |
3 |
=
8 |
9 |
2 |
3 |
1 |
3 |
=
8 |
9 |
1 |
3 |
=
5 |
9 |
(3)
17 |
19 |
17 |
19 |
=
17 |
19 |
17 |
19 |
=0+0.6,
=0.6;
(4)
5 |
8 |
5 |
8 |
1 |
2 |
=
5 |
8 |
5 |
8 |
1 |
2 |
=0+
1 |
2 |
=
1 |
2 |
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