题目内容
怎样简便就怎么算.
|
2-
|
(
|
分析:(1)、(2)按照分数四则混合运算顺序进行计算即可.
(3)运用乘法的分配了进行计算,使计算更加简便.
(3)运用乘法的分配了进行计算,使计算更加简便.
解答:解:(1)
×
÷
,
=
×
,
=
,
=2
;
(2)2-
÷
-
,
=2-
×
-
,
=2-
-
,
=2-
,
=
;
(3)(
+
-
)×24,
=24×
+24×
-24×
,
=20+14-21,
=13.
| 7 |
| 8 |
| 6 |
| 7 |
| 5 |
| 16 |
=
| 6 |
| 8 |
| 16 |
| 5 |
=
| 12 |
| 5 |
=2
| 2 |
| 5 |
(2)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 1 |
| 3 |
=2-
| 6 |
| 13 |
| 26 |
| 9 |
| 1 |
| 3 |
=2-
| 4 |
| 3 |
| 1 |
| 3 |
=2-
| 5 |
| 3 |
=
| 1 |
| 3 |
(3)(
| 5 |
| 6 |
| 7 |
| 12 |
| 7 |
| 8 |
=24×
| 5 |
| 6 |
| 7 |
| 12 |
| 7 |
| 8 |
=20+14-21,
=13.
点评:本题考查分数的加减,乘除的计算法则,运算的顺序,计算能力.
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