题目内容
计算,能简算的要简算.
(1)6÷(0.4÷16)
(2)(
-
)×4×9
(3)
+
-(
-
).
(1)6÷(0.4÷16)
(2)(
| 1 |
| 9 |
| 1 |
| 12 |
(3)
| 11 |
| 12 |
| 5 |
| 8 |
| 3 |
| 8 |
| 1 |
| 12 |
分析:(1)小数小括号里面的除法,再算括号外面的除法;
(2)根据乘法分配律进行简算;
(3)根据加法交换律和结合律以及减法的性质进行计算.
(2)根据乘法分配律进行简算;
(3)根据加法交换律和结合律以及减法的性质进行计算.
解答:解:
(1)6÷(0.4÷16),
=6÷0.025,
=240;
(2)(
-
)×4×9,
=
×4×9-
×4×9,
=4-3,
=1;
(3)
+
-(
-
),
=
+
-
+
,
=(
+
)+(
-
),
=1+
,
=1
.
(1)6÷(0.4÷16),
=6÷0.025,
=240;
(2)(
| 1 |
| 9 |
| 1 |
| 12 |
=
| 1 |
| 9 |
| 1 |
| 12 |
=4-3,
=1;
(3)
| 11 |
| 12 |
| 5 |
| 8 |
| 3 |
| 8 |
| 1 |
| 12 |
=
| 11 |
| 12 |
| 5 |
| 8 |
| 3 |
| 8 |
| 1 |
| 12 |
=(
| 11 |
| 12 |
| 1 |
| 12 |
| 5 |
| 8 |
| 3 |
| 8 |
=1+
| 1 |
| 4 |
=1
| 1 |
| 4 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
练习册系列答案
相关题目