题目内容
计算下列各式的值
(1)0.064 -
-(-
)0+160.75+0.25
(2)lg5+(log32)•(log89)+lg2.
(1)0.064 -
| 1 |
| 3 |
| 7 |
| 8 |
| 1 |
| 2 |
(2)lg5+(log32)•(log89)+lg2.
(1)0.064 -
-(-
)0+160.75+0.25
=((0.4)3)-
-1+(24)
+(0.52)
=(0.4)-1-1+8+0.5
=2.5-1+8+0.5
=10;
(2)lg5+(log32)•(log89)+lg2
=lg5+
•
+lg2
=1+
•
=1+
=
.
| 1 |
| 3 |
| 7 |
| 8 |
| 1 |
| 2 |
=((0.4)3)-
| 1 |
| 3 |
| 3 |
| 4 |
| 1 |
| 2 |
=(0.4)-1-1+8+0.5
=2.5-1+8+0.5
=10;
(2)lg5+(log32)•(log89)+lg2
=lg5+
| lg2 |
| lg3 |
| lg9 |
| lg8 |
=1+
| lg2 |
| lg3 |
| 2lg3 |
| 3lg2 |
=1+
| 2 |
| 3 |
| 5 |
| 3 |
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