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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