题目内容
怎样算简便就怎样算
3×(
| 24×(
|
|
|
(1)3×(
+
)-
,
=3×
-
,
=
-
,
=
;
(2)24×(
+
+
),
=24×
+24×
+24×
,
=9+8+10,
=27;
(3)
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)
×28,
=
×(27+1),
=
×27+
,
=26+
,
=26
.
| 2 |
| 15 |
| 1 |
| 12 |
| 1 |
| 4 |
=3×
| 13 |
| 60 |
| 1 |
| 4 |
=
| 13 |
| 20 |
| 5 |
| 20 |
=
| 2 |
| 5 |
(2)24×(
| 3 |
| 8 |
| 1 |
| 3 |
| 5 |
| 12 |
=24×
| 3 |
| 8 |
| 1 |
| 3 |
| 5 |
| 12 |
=9+8+10,
=27;
(3)
| 9 |
| 17 |
| 1 |
| 7 |
| 8 |
| 17 |
=
| 9 |
| 17 |
| 1 |
| 7 |
| 1 |
| 7 |
| 8 |
| 17 |
=(
| 9 |
| 17 |
| 8 |
| 17 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
(4)
| 26 |
| 27 |
=
| 26 |
| 27 |
=
| 26 |
| 27 |
| 26 |
| 27 |
=26+
| 26 |
| 27 |
=26
| 26 |
| 27 |
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