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9
14
×
3
8
÷
3
14
2
9
×
3
5
+
4
9
×
3
5
2.8×(
1
7
+
3
28
1
2
-
1
4
÷
5
8
)×
5
7
19
4
×
1
5
+
19
4
÷
5
4
+
19
4
分析:(1)、(4)根据四则混合运算的运算顺序计算即可.
(2)、(3)、(5)根据数值的特点运用乘法分配律进行计算较为简便.
解答:解:(1)
9
14
×
3
8
÷
3
14

=
9
14
×
3
8
×
14
3

=1
1
8


(2)
2
9
×
3
5
+
4
9
×
3
5

=(
2
9
+
4
9
)×
3
5

=
2
3
×
3
5

=
2
5


(3)2.8×(
1
7
+
3
28
),
=2.8×
1
7
+
3
28
×2.8,
=0.4+0.3,
=0.7;

(4)(
1
2
-
1
4
÷
5
8
)×
5
7

=(
1
2
-
2
5
)×
5
7

=
1
10
×
5
7

=
1
14


(5)
19
4
×
1
5
+
19
4
÷
5
4
+
19
4

=
19
4
×
1
5
+
19
4
×
4
5
+
19
4

=
19
4
×(
1
5
+
4
5
+1
),
=9.5.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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