题目内容
(1)(-3)2006×(-| 1 |
| 3 |
(2)(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2007 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2006 |
| 1 |
| 2 |
| 1 |
| 2007 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2006 |
分析:(1)逆用积的乘方性质:an•bn=(ab)n,计算;
(2)设1+
+
+…+
=m,1+
+
+…+
=n,将原式转化为含m、n的代数式运算.
(2)设1+
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2007 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2006 |
解答:解:(1)(-3)2006×(-
)2007=(-3)2006×)×(-
)2006×(-
)
=[(-3)×(-
)]2006×(-
)
=-
;
(2)设1+
+
+…+
=m,1+
+
+…+
=n,则
原式=(m-1)n-m(n-1)=m-n=
.
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
=[(-3)×(-
| 1 |
| 3 |
| 1 |
| 3 |
=-
| 1 |
| 3 |
(2)设1+
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2007 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2006 |
原式=(m-1)n-m(n-1)=m-n=
| 1 |
| 2007 |
点评:本题考查了积的乘方性质的运用,用代数方法解决复杂运算的问题,学会这些方法,能提高运算能力.
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