题目内容
精简巧算:
(
| 12
|
|
|
(1)(
+
)×48,
=
×48+
×48,
=40+18,
=58;
(2)12
÷25,
=12.25÷25,
=0.49;
(3)
÷
,
=
×77,
=
×(78-1),
=
×78-1×
,
=59-
,
=58
;
(4)
÷23+
×
,
=
×
+
×
,
=(
+
)×
,
=
.
| 5 |
| 6 |
| 3 |
| 8 |
=
| 5 |
| 6 |
| 3 |
| 8 |
=40+18,
=58;
(2)12
| 1 |
| 4 |
=12.25÷25,
=0.49;
(3)
| 59 |
| 78 |
| 1 |
| 77 |
=
| 59 |
| 78 |
=
| 59 |
| 78 |
=
| 59 |
| 78 |
| 59 |
| 78 |
=59-
| 59 |
| 78 |
=58
| 19 |
| 78 |
(4)
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
=
| 8 |
| 17 |
| 1 |
| 23 |
| 1 |
| 23 |
| 9 |
| 17 |
=(
| 8 |
| 17 |
| 9 |
| 17 |
| 1 |
| 23 |
=
| 1 |
| 23 |
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