题目内容
计算下列各题:
(1)0.0081
+(4-
)2+(8)-
-16-0.75;
(2)lg25+lg2lg50.
(1)0.0081
| 1 |
| 4 |
| 3 |
| 4 |
| 4 |
| 3 |
(2)lg25+lg2lg50.
(1)原式0.0081
+(4-
)2+(8)-
-16-0.75
=(0.3)4×
+(2-
)2+(23)-
-2-4×0.75
=
+
+
-
=
.(5分)
(2)原式lg25+lg2lg50
=lg25+2lg2lg5+lg25
=(lg2+lg5)2
=1 (5分)
| 1 |
| 4 |
| 3 |
| 4 |
| 4 |
| 3 |
=(0.3)4×
| 1 |
| 4 |
| 3 |
| 2 |
| 4 |
| 3 |
=
| 3 |
| 10 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 8 |
=
| 29 |
| 80 |
(2)原式lg25+lg2lg50
=lg25+2lg2lg5+lg25
=(lg2+lg5)2
=1 (5分)
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