题目内容
下面各题怎样算简便就怎样算.
(1)36×
| (2)(
| (3)
| ||||||||||||||||||
(4)
| (5)
| (6)24×(
|
(1)36×
×
×42
=(36×
)×(
×42)
=
×12
=30;
(2)(
+
)÷
=
×
+
×
=2+1
=3;
(3)
×
+
×
=
×(
+
)
=
×1
=
;
(4)
÷
÷
=
÷
÷
=1÷
=1
;
(5)
×8÷
=
÷
=
=5
;
(6)24×(
+
+
)
=24×
+24×
+24×
=8+9+14
=31.
| 2 |
| 7 |
| 5 |
| 72 |
=(36×
| 5 |
| 72 |
| 2 |
| 7 |
=
| 5 |
| 2 |
=30;
(2)(
| 7 |
| 8 |
| 7 |
| 16 |
| 7 |
| 16 |
=
| 7 |
| 8 |
| 16 |
| 7 |
| 7 |
| 16 |
| 16 |
| 7 |
=2+1
=3;
(3)
| 6 |
| 7 |
| 3 |
| 4 |
| 1 |
| 4 |
| 6 |
| 7 |
=
| 6 |
| 7 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 6 |
| 7 |
=
| 6 |
| 7 |
(4)
| 7 |
| 8 |
| 2 |
| 3 |
| 7 |
| 8 |
=
| 7 |
| 8 |
| 7 |
| 8 |
| 2 |
| 3 |
=1÷
| 2 |
| 3 |
=1
| 1 |
| 2 |
(5)
| 5 |
| 9 |
| 7 |
| 9 |
=
| 40 |
| 9 |
| 7 |
| 9 |
=
| 40 |
| 7 |
=5
| 5 |
| 7 |
(6)24×(
| 1 |
| 3 |
| 3 |
| 8 |
| 7 |
| 12 |
=24×
| 1 |
| 3 |
| 3 |
| 8 |
| 7 |
| 12 |
=8+9+14
=31.
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