题目内容
[(
-0.375)×
+
×
]÷2
×
+
×
]÷2
÷2
.
| 5 |
| 4 |
| 5 |
| 26 |
| 1 |
| 8 |
| 5 |
| 26 |
| 4 |
| 13 |
| 5 |
| 26 |
| 1 |
| 8 |
| 5 |
| 26 |
| 4 |
| 13 |
| 4 |
| 13 |
分析:把0.375化为分数,中括号内运用乘法分配律简算,最后算括号外的乘法.
解答:解:[(
-0.375)×
+
×
]÷2
,
=[(
-
)×
+
×
]÷2
,
=[(
-
+
)×
]×
,
=[1×
]×
,
=
×
,
=
.
| 5 |
| 4 |
| 5 |
| 26 |
| 1 |
| 8 |
| 5 |
| 26 |
| 4 |
| 13 |
=[(
| 5 |
| 4 |
| 3 |
| 8 |
| 5 |
| 26 |
| 1 |
| 8 |
| 5 |
| 26 |
| 4 |
| 13 |
=[(
| 5 |
| 4 |
| 3 |
| 8 |
| 1 |
| 8 |
| 5 |
| 26 |
| 13 |
| 30 |
=[1×
| 5 |
| 26 |
| 13 |
| 30 |
=
| 5 |
| 26 |
| 13 |
| 30 |
=
| 1 |
| 12 |
点评:此题考查四则混合运算,要仔细观察算式的特点,灵活运用所学定律进行简便计算.
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