题目内容
脱式计算.
(2
|
[3.6-(1.6+
| ||||||||||||||||
|
(1+
|
分析:(1)根据算式的特点,可利用乘法的意义把原式改写为:(2
×4)×0.25,然后再利用乘法结合律进行进行计算即可;
(2)(3)根据题意,可按照小数、分数四则混合运算的运算方法进行计算即可;
(4)先根据整数和分数的计算方法进行计算即可.
| 5 |
| 9 |
(2)(3)根据题意,可按照小数、分数四则混合运算的运算方法进行计算即可;
(4)先根据整数和分数的计算方法进行计算即可.
解答:解:(1)(2
+2
+2
+2
)×0.25,
=(2
×4)×0.25,
=2
×(4×0.25),
=2
×1,
=2
;
(2)[3.6-(1.6+
)-
]×
,
=[3.6-1.6+
-
]×
,
=[2+
-
]×
,
=
×
,
=
;
(3)
×[
-(
-0.25)]
=
×[
-
],
=
×
,
=
;
(4)(1+
)×(1+
)×(1+
)×(1+
)×(1+
)
=
×
×
×
×
,
=1
.
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
=(2
| 5 |
| 9 |
=2
| 5 |
| 9 |
=2
| 5 |
| 9 |
=2
| 5 |
| 9 |
(2)[3.6-(1.6+
| 2 |
| 9 |
| 7 |
| 9 |
| 3 |
| 7 |
=[3.6-1.6+
| 2 |
| 9 |
| 7 |
| 9 |
| 3 |
| 7 |
=[2+
| 2 |
| 9 |
| 7 |
| 9 |
| 3 |
| 7 |
=
| 13 |
| 9 |
| 3 |
| 7 |
=
| 13 |
| 21 |
(3)
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 3 |
| 16 |
=
| 8 |
| 9 |
| 9 |
| 16 |
=
| 1 |
| 2 |
(4)(1+
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 8 |
| 1 |
| 9 |
| 1 |
| 10 |
=
| 7 |
| 6 |
| 8 |
| 7 |
| 9 |
| 8 |
| 10 |
| 9 |
| 11 |
| 10 |
=1
| 5 |
| 6 |
点评:此题主要考查的是整数、分数、小数四则混合运算的运算顺序和简便计算的应用.
练习册系列答案
相关题目