题目内容
练习简便计算:
(1)7.8-(2.8+3
)
(2)12.35+4
+23.65.
(1)7.8-(2.8+3
| 5 |
| 7 |
(2)12.35+4
| 7 |
| 12 |
(1)7.8-(2.8+3
),
=(7.8-2.8)-3
,
=5-3
,
=1
;
(2)12.35+4
+23.65,
=(12.35+23.65)+4
,
=36+4
,
=40
.
| 5 |
| 7 |
=(7.8-2.8)-3
| 5 |
| 7 |
=5-3
| 5 |
| 7 |
=1
| 2 |
| 7 |
(2)12.35+4
| 7 |
| 12 |
=(12.35+23.65)+4
| 7 |
| 12 |
=36+4
| 7 |
| 12 |
=40
| 7 |
| 12 |
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