题目内容

计算下面各题,怎样简便怎样算.
12×(
1
4
+
1
6
+
1
12
)

3
4
×
10
9
÷
5
3
4.5+
1
4
×24+5.5
5
9
×
2
7
+
4
9
×
2
7
分析:(1)(4)运用乘法分配律解答,
(2)按照从左到右顺序解答,
(3)运用加法交换律解答.
解答:解:(1)12×(
1
4
+
1
6
+
1
12
),
=12×
1
4
+12×
1
6
+12×
1
12

=3+2+1,
=6;

(2)
3
4
×
10
9
÷
5
3

=
5
6
÷
5
3

=
1
2


(3)4.5+
1
4
×
25+5.5,
=(4.5+5.5)+
1
4
×
25,
=10+6.25,
=16.25;

(4)
5
9
×
2
7
+
4
9
×
2
7

=(
5
9
+
4
9
)×
2
7

=1×
2
7

=
2
7
点评:正确的选择并运用简便算法是解答本题的关键.
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