题目内容
脱式计算,能简算的要简算.
|
| ||||||||||||
|
|
(1)
÷8+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(2)
-
-
,
=
-(
+
),
=
-
,
=0;
(3)
×(
-
)÷
,
=
×
×
,
=
;
(4)
×31-
,
=
×(31-1),
=
×30,
=19.
| 2 |
| 3 |
| 1 |
| 8 |
| 1 |
| 3 |
=
| 2 |
| 3 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 3 |
=
| 1 |
| 8 |
| 2 |
| 3 |
| 1 |
| 3 |
=
| 1 |
| 8 |
=
| 1 |
| 8 |
(2)
| 1 |
| 2 |
| 5 |
| 12 |
| 1 |
| 12 |
=
| 1 |
| 2 |
| 5 |
| 12 |
| 1 |
| 12 |
=
| 1 |
| 2 |
| 1 |
| 2 |
=0;
(3)
| 3 |
| 7 |
| 4 |
| 5 |
| 2 |
| 3 |
| 2 |
| 15 |
=
| 3 |
| 7 |
| 2 |
| 15 |
| 15 |
| 2 |
=
| 3 |
| 7 |
(4)
| 19 |
| 30 |
| 19 |
| 30 |
=
| 19 |
| 30 |
=
| 19 |
| 30 |
=19.
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