题目内容

用简便方法计算.
24×
2
7
×
5
72
×21
8
13
÷7+
1
7
×
6
13

46×
7
45
11.58-(7
5
11
+1.58)
(1)24×
2
7
×
5
72
×21
=21×
2
7
×24×
5
72

=6×
5
3

=10;

(2)
8
13
÷7+
1
7
×
6
13

=
8
13
×
1
7
+
1
7
×
6
13

=(
8
13
+
6
13
)×
1
7

=
14
13
×
1
7

=
2
13


(3)46×
7
45

=(45+1)×
7
45

=45×
7
45
+1×
7
45

=7+
7
45

=7
7
45


(4)11.58-(7
5
11
+1.58)
=11.58-1.58-7
5
11

=10-7
5
11

=2
6
11
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