题目内容
(1)(2
)
+(lg5)0+(
)-
=______;
(2)lg4+lg5lg20+(lg5)2=______.
| 7 |
| 9 |
| 1 |
| 2 |
| 27 |
| 64 |
| 1 |
| 3 |
(2)lg4+lg5lg20+(lg5)2=______.
(1)(2
)
+(lg5)0+(
)-
=
+1+
=
+1+
=4.
(2)lg4+lg5lg20+(lg5)2
=2lg2+lg5(2lg2+lg5)+(lg5)2
=2lg2+2lg5lg2+2(lg5)2
=2lg2+2lg5(lg2+lg5)
=2(lg2+lg5)
=2.
故答案为:4,2.
| 7 |
| 9 |
| 1 |
| 2 |
| 27 |
| 64 |
| 1 |
| 3 |
=
|
| 1 | |||||
|
=
| 5 |
| 3 |
| 4 |
| 3 |
=4.
(2)lg4+lg5lg20+(lg5)2
=2lg2+lg5(2lg2+lg5)+(lg5)2
=2lg2+2lg5lg2+2(lg5)2
=2lg2+2lg5(lg2+lg5)
=2(lg2+lg5)
=2.
故答案为:4,2.
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