题目内容
求值:
(1)0.16-
-(2009)0+16
+log2
;
(2)(lg2)2+lg2•lg50+lg25.
(1)0.16-
| 1 |
| 2 |
| 3 |
| 4 |
| 2 |
(2)(lg2)2+lg2•lg50+lg25.
(1)0.16-
-(2009)0+16
+log2
=
-1+8+
=10.
(2)(lg2)2+lg2•lg50+lg25
=(lg2)2+lg2(lg2+2lg5)+2lg5
=2(lg2)2+2lg2lg5+2lg5
=2lg2(lg2+lg5)+2lg5
=2lg2+2lg5
=2.
| 1 |
| 2 |
| 3 |
| 4 |
| 2 |
=
| 5 |
| 2 |
| 1 |
| 2 |
=10.
(2)(lg2)2+lg2•lg50+lg25
=(lg2)2+lg2(lg2+2lg5)+2lg5
=2(lg2)2+2lg2lg5+2lg5
=2lg2(lg2+lg5)+2lg5
=2lg2+2lg5
=2.
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