题目内容
能简算的要简便算.
|
15×(
|
97×
| ||||||||||||||||||||
(
|
|
[1-(
|
分析:(1)、(5)、(6)按照分数四则混合运算的顺序进行计算即可.
(2)、(3)、(4)运用分数乘法的就是法则进行计算即可.
(2)、(3)、(4)运用分数乘法的就是法则进行计算即可.
解答:解:(1)
×21×
,
=
×
,
=1;
(2)15×(
+
),
=15×
+
×15,
=10+9,
=19;
(3)97×
,
=(96+1)×
,
=96×
+1×
,
=5
;
(4)(
+
+
)×24,
=24×
+24×
+
×24,
=8+6+1,
=15;
(5)
×
+
÷1
,
=
+
×
,
=
+
,
=
+
,
=
;
(6)[1-(
+
)]÷
,
=[1-
]×4,
=
×4,
=1.5;
| 2 |
| 15 |
| 5 |
| 14 |
=
| 42 |
| 15 |
| 5 |
| 14 |
=1;
(2)15×(
| 2 |
| 3 |
| 3 |
| 5 |
=15×
| 2 |
| 3 |
| 3 |
| 5 |
=10+9,
=19;
(3)97×
| 5 |
| 96 |
=(96+1)×
| 5 |
| 96 |
=96×
| 5 |
| 96 |
| 5 |
| 96 |
=5
| 5 |
| 96 |
(4)(
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 24 |
=24×
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 24 |
=8+6+1,
=15;
(5)
| 3 |
| 5 |
| 2 |
| 3 |
| 2 |
| 5 |
| 1 |
| 2 |
=
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 3 |
=
| 2 |
| 5 |
| 4 |
| 15 |
=
| 6 |
| 15 |
| 4 |
| 15 |
=
| 2 |
| 3 |
(6)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
=
| 3 |
| 8 |
=1.5;
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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| ( | [1-( |