题目内容
计算:(2009
×
-2008.875÷3
)×3
.
| 1 |
| 3 |
| 3 |
| 11 |
| 2 |
| 3 |
| 3 |
| 7 |
分析:把算式中的2008.875÷3
改写成2008
×
,进而逆用乘法分配律简算得解.
| 2 |
| 3 |
| 7 |
| 8 |
| 3 |
| 11 |
解答:解:(2009
×
-2008.875÷3
)×3
,
=(2009
×
-2008
×
)×
,
=(2009
-2008
)×
×
,
=
×
×
,
=
.
| 1 |
| 3 |
| 3 |
| 11 |
| 2 |
| 3 |
| 3 |
| 7 |
=(2009
| 1 |
| 3 |
| 3 |
| 11 |
| 7 |
| 8 |
| 3 |
| 11 |
| 24 |
| 7 |
=(2009
| 1 |
| 3 |
| 7 |
| 8 |
| 3 |
| 11 |
| 24 |
| 7 |
=
| 11 |
| 24 |
| 3 |
| 11 |
| 24 |
| 7 |
=
| 3 |
| 7 |
点评:考查了分数、小数四则混合运算,注意运算顺序和运算法则,能灵活运用所学的运算律进行简便计算.
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