题目内容
用简便方法计算.(要求写出简便过程)
| 15.3-7.28+4.7-2.72 | (24+
|
|
(1)15.3-7.28+4.7-2.72,
=15.3+4.7-(7.28+2.72),
=20-10,
=10;
(2)(24+
)÷6,
=24×
+
×
,
=4+
,
=4
;
(3)
×
+
÷
,
=
×(
+
),
=
×1,
=
.
=15.3+4.7-(7.28+2.72),
=20-10,
=10;
(2)(24+
| 6 |
| 7 |
=24×
| 1 |
| 6 |
| 6 |
| 7 |
| 1 |
| 6 |
=4+
| 1 |
| 7 |
=4
| 1 |
| 7 |
(3)
| 7 |
| 9 |
| 5 |
| 11 |
| 7 |
| 9 |
| 11 |
| 6 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 6 |
| 11 |
=
| 7 |
| 9 |
=
| 7 |
| 9 |
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