题目内容
计算:(1)lg25+lg2•lg50+(lg2)2;
(2)(2
)
-(-2009)0-(
)-
+(
)-2.
(2)(2
| 1 |
| 4 |
| 1 |
| 2 |
| 27 |
| 8 |
| 2 |
| 3 |
| 3 |
| 2 |
(1)原式=2lg5+lg2•(1+lg5)+(lg2)2…(2分)
=2lg5+lg2(1+lg5+lg2)…(4分)
=2lg5+2lg2…(6分)=2…(7分)
(2)原式=(
)
-1-(
)-
+(
)-2…(2分)
=[(
)2]
-1-[(
)3]-
+(
)-2…(4分)
=(
)2×
-1-(
)3×(-
)+(
)-2…(5分)
=
-1-(
)-2+(
)-2…(6分)
=
…(7分)
=2lg5+lg2(1+lg5+lg2)…(4分)
=2lg5+2lg2…(6分)=2…(7分)
(2)原式=(
| 9 |
| 4 |
| 1 |
| 2 |
| 27 |
| 8 |
| 2 |
| 3 |
| 3 |
| 2 |
=[(
| 3 |
| 2 |
| 1 |
| 2 |
| 3 |
| 2 |
| 2 |
| 3 |
| 3 |
| 2 |
=(
| 3 |
| 2 |
| 1 |
| 2 |
| 3 |
| 2 |
| 2 |
| 3 |
| 3 |
| 2 |
=
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
=
| 1 |
| 2 |
练习册系列答案
相关题目