题目内容

计算下列各题、能简便的要简便计算
(1)3.2×1.25+4.8×1
1
4
(2)(15-14×
4
7
)×
8
21
(3)28.2×44.54+4.454×718(4)
8
15
×
5
16
+
5
27
÷
10
9

(1)3.2×1.25+4.8×1
1
4

=3.2×1.25+4.8×1.25,
=(3.2+4.8)×1.25,
=8×1.25,
=10;

(2)(15-14×
4
7
)×
8
21

=(15-8)×
8
21

=7×
8
21

=
8
3


(3)28.2×44.54+4.454×718,
=28.2×44.54+44.54×71.8,
=(28.2+71.8)×44.54,
=100×44.54,
=4454;

(4)
8
15
×
5
16
+
5
27
÷
10
9

=
1
6
+
1
6

=
1
3
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