题目内容
用递等式计算.
0.8×(3.2-2.95)
(
-
)÷
÷
+
÷
57×
+
.
0.8×(3.2-2.95)
(
| 5 |
| 6 |
| 2 |
| 3 |
| 7 |
| 12 |
| 5 |
| 17 |
| 3 |
| 2 |
| 1 |
| 3 |
| 17 |
| 5 |
57×
| 55 |
| 56 |
| 1 |
| 56 |
0.8×(3.2-2.95),
=0.8×0.25,
=0.2;
(2)(
-
)÷
,
=
×
,
=
;
(3)
÷
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(4)57×
+
,
=(56+1)×
+
,
=56×
+
+
,
=56×
+(
+
),
=55+1,
=56.
=0.8×0.25,
=0.2;
(2)(
| 5 |
| 6 |
| 2 |
| 3 |
| 7 |
| 12 |
=
| 1 |
| 6 |
| 12 |
| 7 |
=
| 2 |
| 7 |
(3)
| 5 |
| 17 |
| 3 |
| 2 |
| 1 |
| 3 |
| 17 |
| 5 |
=
| 5 |
| 17 |
| 2 |
| 3 |
| 1 |
| 3 |
| 5 |
| 17 |
=
| 5 |
| 17 |
| 2 |
| 3 |
| 1 |
| 3 |
=
| 5 |
| 17 |
=
| 5 |
| 17 |
(4)57×
| 55 |
| 56 |
| 1 |
| 56 |
=(56+1)×
| 55 |
| 56 |
| 1 |
| 56 |
=56×
| 55 |
| 56 |
| 55 |
| 56 |
| 1 |
| 56 |
=56×
| 55 |
| 56 |
| 55 |
| 56 |
| 1 |
| 56 |
=55+1,
=56.
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