题目内容

用简便方法计算.
0.5+1
2
13
+2
1
2
+
7
13

2
1
4
×6
3
4
+6.75×75%

1.5×2004+2004×
1
2
-2004
(1)0.5+1
2
13
+2
1
2
+
7
13

=
1
2
+1
2
13
+2
1
2
+
7
13

=(
1
2
+2
1
2
)+(1
2
13
+
7
13
),
=3+2,
=5;

(2)2
1
4
×6
3
4
+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×
1
2
-2004,
=1.5×2004+2004×0.5-2004,
=(1.5+0.5-1)×2004,
=1×2004,
=2004.
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