题目内容
正面各题,怎样简便就怎样算.
-
-
=
×
÷
=
25-25×
÷9+
×
.
| 14 |
| 5 |
| 1 |
| 3 |
| 5 |
| 3 |
| 2 |
| 3 |
| 5 |
| 4 |
| 10 |
| 9 |
25-25×
| 3 |
| 4 |
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 9 |
(1)
-
-
,
=2
-(
+
),
=2
-2,
=
;
(2)
×
÷
,
=
×
×
,
=
;
(3)25-25×
,
=(1-
)×25,
=
×25,
=
;
(4)
÷9+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
| 14 |
| 5 |
| 1 |
| 3 |
| 5 |
| 3 |
=2
| 4 |
| 5 |
| 1 |
| 3 |
| 5 |
| 3 |
=2
| 4 |
| 5 |
=
| 4 |
| 5 |
(2)
| 2 |
| 3 |
| 5 |
| 4 |
| 10 |
| 9 |
=
| 2 |
| 3 |
| 5 |
| 4 |
| 9 |
| 10 |
=
| 3 |
| 4 |
(3)25-25×
| 3 |
| 4 |
=(1-
| 3 |
| 4 |
=
| 1 |
| 4 |
=
| 25 |
| 4 |
(4)
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 9 |
=
| 5 |
| 12 |
| 1 |
| 9 |
| 7 |
| 12 |
| 1 |
| 9 |
=(
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 9 |
=1×
| 1 |
| 9 |
=
| 1 |
| 9 |
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