题目内容
用简便方法计算.
24×
×
×21
÷7+
×
46×
11.58-(7
+1.58)
24×
2 |
7 |
5 |
72 |
8 |
13 |
1 |
7 |
6 |
13 |
46×
7 |
45 |
5 |
11 |
(1)24×
×
×21
=21×
×24×
,
=6×
,
=10;
(2)
÷7+
×
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(3)46×
=(45+1)×
,
=45×
+1×
,
=7+
,
=7
;
(4)11.58-(7
+1.58)
=11.58-1.58-7
,
=10-7
,
=2
.
2 |
7 |
5 |
72 |
=21×
2 |
7 |
5 |
72 |
=6×
5 |
3 |
=10;
(2)
8 |
13 |
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 |
7 |
45 |
=7+
7 |
45 |
=7
7 |
45 |
(4)11.58-(7
5 |
11 |
=11.58-1.58-7
5 |
11 |
=10-7
5 |
11 |
=2
6 |
11 |
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