题目内容
[4
-(2
+0.64)÷3
+
]×4.5.
| 5 |
| 9 |
| 2 |
| 5 |
| 1 |
| 25 |
| 5 |
| 6 |
分析:通过观察,先把0.64化为分数,然后按运算顺序计算,先算小括号内的加法,再算小括号外的除法,结果为1;然后再算中括号内的,最后算括号外的乘法.
解答:解:[4
-(2
+0.64)÷3
+
]×4.5,
=[
-(
+
)÷
+
]×
,
=[
-
×
+
]×
,
=[
-1+
]×
,
=[
+
]×
,
=
×
,
=
.
| 5 |
| 9 |
| 2 |
| 5 |
| 1 |
| 25 |
| 5 |
| 6 |
=[
| 41 |
| 9 |
| 12 |
| 5 |
| 16 |
| 25 |
| 76 |
| 25 |
| 5 |
| 6 |
| 9 |
| 2 |
=[
| 41 |
| 9 |
| 76 |
| 25 |
| 25 |
| 76 |
| 5 |
| 6 |
| 9 |
| 2 |
=[
| 41 |
| 9 |
| 5 |
| 6 |
| 9 |
| 2 |
=[
| 32 |
| 9 |
| 5 |
| 6 |
| 9 |
| 2 |
=
| 79 |
| 18 |
| 9 |
| 2 |
=
| 79 |
| 4 |
点评:凡是简算的题目,就是根据数字特点或运算定律,灵活简算.此题考查了学生灵活处理数字的能力.
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