题目内容
计算(能简算的一定要简算)
(1)1-
-
-
-
-
(2)0.125×
+
×
+50%×
.
(1)1-
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
(2)0.125×
| 11 |
| 13 |
| 11 |
| 13 |
| 3 |
| 8 |
| 11 |
| 13 |
分析:(1)根据题意,先计算1-
=
,
-
=
,
-
=
…,然后一步步进行计算即可;
(2)把
化成0.375,50%化成0.5,再根据乘法分配律进行计算即可.
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
(2)把
| 3 |
| 8 |
解答:解:
(1)1-
-
-
-
-
,
=
-
-
-
-
,
=
-
-
-
,
=
-
-
,
=
-
,
=
;
(2)0.125×
+
×
+50%×
,
=0.125×
+
×0.375+0.5×
,
=
×(0.125+0.375+0.5),
=
×1,
=
.
(1)1-
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
=
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
=
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
=
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
=
| 1 |
| 16 |
| 1 |
| 32 |
=
| 1 |
| 32 |
(2)0.125×
| 11 |
| 13 |
| 11 |
| 13 |
| 3 |
| 8 |
| 11 |
| 13 |
=0.125×
| 11 |
| 13 |
| 11 |
| 13 |
| 11 |
| 13 |
=
| 11 |
| 13 |
=
| 11 |
| 13 |
=
| 11 |
| 13 |
点评:根据题意,找准所要使用的运算定律,然后再进一步解答即可.
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