题目内容

用简便方法计算下面各题
(1)
44
5
+
21
4
+
6
5
+
11
4

(2)
23
4
×
3
7
+
27
4
×
3
7

(3)4.3×11.8+86×0.91
(4)7.46×36+74.6×6.4.
(1)
44
5
+
21
4
+
6
5
+
11
4

=(
44
5
+
6
5
)+(
21
4
+
11
4
),
=10+8,
=18;

(2)
23
4
×
3
7
+
27
4
×
3
7

=(
23
4
+
27
4
)×
3
7

=
25
2
×
3
7

=
75
14


(3)4.3×11.8+86×0.91,
=43×1.18+43×1.82,
=43×(1.18+1.82),
=43×3,
=129;

(4)7.46×36+74.6×6.4,
=74.6×3.6+74.6×6.4,
=74.6×(3.6+6.4),
=74.6×10,
=746.
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