题目内容
用简便方法计算
①5
-4
-6
+7
②
÷
+
×0.4
③(
+
-
)×45
④2012×
.
①5
| 3 |
| 7 |
| 4 |
| 9 |
| 5 |
| 9 |
| 4 |
| 7 |
②
| 5 |
| 7 |
| 5 |
| 2 |
| 30 |
| 7 |
③(
| 5 |
| 9 |
| 4 |
| 5 |
| 7 |
| 15 |
④2012×
| 2011 |
| 2013 |
(1)5
-4
-6
+7
,
=5
+7
-(4
+6
),
=13-11,
=2;
(2)
÷
+
×0.4,
=(
+
)×
,
=5×
,
=2;
(3)(
+
-
)×45,
=
×45+
×45-
×45,
=25+36-21,
=40;
(4)2012×
,
=(2013-1)×
,
=2013×
-1×
,
=2011-
,
=2000
.
| 3 |
| 7 |
| 4 |
| 9 |
| 5 |
| 9 |
| 4 |
| 7 |
=5
| 3 |
| 7 |
| 4 |
| 7 |
| 4 |
| 9 |
| 5 |
| 9 |
=13-11,
=2;
(2)
| 5 |
| 7 |
| 5 |
| 2 |
| 30 |
| 7 |
=(
| 5 |
| 7 |
| 30 |
| 7 |
| 2 |
| 5 |
=5×
| 2 |
| 5 |
=2;
(3)(
| 5 |
| 9 |
| 4 |
| 5 |
| 7 |
| 15 |
=
| 5 |
| 9 |
| 4 |
| 5 |
| 7 |
| 15 |
=25+36-21,
=40;
(4)2012×
| 2011 |
| 2013 |
=(2013-1)×
| 2011 |
| 2013 |
=2013×
| 2011 |
| 2013 |
| 2011 |
| 2013 |
=2011-
| 2011 |
| 2013 |
=2000
| 2 |
| 2013 |
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