题目内容
用喜欢的方法计算.
0.4×0.27×25
×(
-
)
×[
÷(
-
)]
÷7+
×
.
0.4×0.27×25
| 3 |
| 4 |
| 4 |
| 5 |
| 3 |
| 10 |
| 3 |
| 8 |
| 8 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
| 8 |
| 13 |
| 1 |
| 7 |
| 8 |
| 13 |
考点:小数四则混合运算,运算定律与简便运算,分数的四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:①运用乘法的交换律及结合律进行计算即可.
②先计算括号内部的,再计算乘法.
③根据四则混合运算的运算顺序计算即可.
④运用乘法的分配律进行计算即可.
②先计算括号内部的,再计算乘法.
③根据四则混合运算的运算顺序计算即可.
④运用乘法的分配律进行计算即可.
解答:
解:①0.4×0.27×25
=(0.4×25)×0.27
=10×0.27
=2.7
②
×(
-
)
=
×(
-
)
=
×
=
③
×[
÷(
-
)]
=
×[
÷(
-
)]
=
×[
×12]
=
×
=4
④
÷7+
×
=
×
+
×
=
×(
+
)
=
=(0.4×25)×0.27
=10×0.27
=2.7
②
| 3 |
| 4 |
| 4 |
| 5 |
| 3 |
| 10 |
=
| 3 |
| 4 |
| 8 |
| 10 |
| 3 |
| 10 |
=
| 3 |
| 4 |
| 1 |
| 5 |
=
| 3 |
| 20 |
③
| 3 |
| 8 |
| 8 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
=
| 3 |
| 8 |
| 8 |
| 9 |
| 10 |
| 12 |
| 9 |
| 12 |
=
| 3 |
| 8 |
| 8 |
| 9 |
=
| 3 |
| 8 |
| 32 |
| 3 |
=4
④
| 8 |
| 13 |
| 1 |
| 7 |
| 8 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 8 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
=
| 16 |
| 91 |
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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