题目内容
用简便方法计算.
0.5+1
+2
+
2
×6
+6.75×75%
1.5×2004+2004×
-2004.
0.5+1
| 2 |
| 13 |
| 1 |
| 2 |
| 7 |
| 13 |
2
| 1 |
| 4 |
| 3 |
| 4 |
1.5×2004+2004×
| 1 |
| 2 |
(1)0.5+1
+2
+
,
=
+1
+2
+
,
=(
+2
)+(1
+
),
=3+2,
=5;
(2)2
×6
+6.75×75%,
=2.25×6.75+6.75×0.75,
=(2.25+0.75)×6.75,
=3×6.75,
=20.25;
(3)1.5×2004+2004×
-2004,
=1.5×2004+2004×0.5-2004,
=(1.5+0.5-1)×2004,
=1×2004,
=2004.
| 2 |
| 13 |
| 1 |
| 2 |
| 7 |
| 13 |
=
| 1 |
| 2 |
| 2 |
| 13 |
| 1 |
| 2 |
| 7 |
| 13 |
=(
| 1 |
| 2 |
| 1 |
| 2 |
| 2 |
| 13 |
| 7 |
| 13 |
=3+2,
=5;
(2)2
| 1 |
| 4 |
| 3 |
| 4 |
=2.25×6.75+6.75×0.75,
=(2.25+0.75)×6.75,
=3×6.75,
=20.25;
(3)1.5×2004+2004×
| 1 |
| 2 |
=1.5×2004+2004×0.5-2004,
=(1.5+0.5-1)×2004,
=1×2004,
=2004.
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