题目内容
| 下面各题怎样简便就怎样算. (1)
| (2)24×(
| (3)3-
| ||||||||||||||||
(4)
| (5)
|
(1)
×
÷
,
=
×
×
,
=
;
(2)24×(
+
),
=24×
+
×24,
=6+20,
=26;
(3)3-
÷
-
,
=3-
×
-
,
=3-
-
,
=3-(
+
),
=3-1,
=2;
(4)
×
+
÷7,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(5)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
×15,
=3.
| 3 |
| 4 |
| 7 |
| 12 |
| 14 |
| 9 |
=
| 3 |
| 4 |
| 7 |
| 12 |
| 9 |
| 14 |
=
| 9 |
| 32 |
(2)24×(
| 1 |
| 4 |
| 5 |
| 6 |
=24×
| 1 |
| 4 |
| 5 |
| 6 |
=6+20,
=26;
(3)3-
| 3 |
| 2 |
| 21 |
| 10 |
| 2 |
| 7 |
=3-
| 3 |
| 2 |
| 10 |
| 21 |
| 2 |
| 7 |
=3-
| 5 |
| 7 |
| 2 |
| 7 |
=3-(
| 5 |
| 7 |
| 2 |
| 7 |
=3-1,
=2;
(4)
| 3 |
| 4 |
| 1 |
| 7 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 7 |
| 1 |
| 4 |
| 1 |
| 7 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
(5)
| 1 |
| 5 |
| 1 |
| 13 |
| 1 |
| 5 |
| 2 |
| 3 |
=
| 1 |
| 5 |
| 1 |
| 13 |
| 13 |
| 15 |
=
| 1 |
| 5 |
| 1 |
| 15 |
=
| 1 |
| 5 |
=3.
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