题目内容
计算:42009×(-0.25)2008-1=______.
42009×(-0.25)2008-1,
=4×42008×(-
)2008-1,
=4×[4×(-
)]2008-1,
=4×(-1)2008-1,
=4-1,
=3.
=4×42008×(-
| 1 |
| 4 |
=4×[4×(-
| 1 |
| 4 |
=4×(-1)2008-1,
=4-1,
=3.
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计算(-0.25)2010×42009结果正确的是( )
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| ||
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| C、-1 | ||
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