题目内容
下面各题,怎样简便就怎样算.
| (
|
|
(1)
÷
÷
,
=
×2×
,
=
×
,
=1
;
(2)(
+
)÷
,
=(
+
)×
,
=
×
+
×
,
=
+1,
=4
;
(3)
÷0.2×
,
=
÷
×
,
=
×5×
,
=
.
| 3 |
| 4 |
| 1 |
| 2 |
| 15 |
| 14 |
=
| 3 |
| 4 |
| 14 |
| 15 |
=
| 3 |
| 2 |
| 14 |
| 15 |
=1
| 2 |
| 5 |
(2)(
| 4 |
| 9 |
| 2 |
| 15 |
| 2 |
| 15 |
=(
| 4 |
| 9 |
| 2 |
| 15 |
| 15 |
| 2 |
=
| 4 |
| 9 |
| 15 |
| 2 |
| 2 |
| 15 |
| 15 |
| 2 |
=
| 10 |
| 3 |
=4
| 1 |
| 3 |
(3)
| 3 |
| 20 |
| 2 |
| 3 |
=
| 3 |
| 20 |
| 1 |
| 5 |
| 2 |
| 3 |
=
| 3 |
| 20 |
| 2 |
| 3 |
=
| 1 |
| 2 |
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