题目内容
求下列函数的值:
(1)(
)
×(
)-1+4×(
)-
;
(2)lg
-
lg2
+lg7
.
(1)(
| 9 |
| 25 |
| 1 |
| 2 |
| 1 |
| 10 |
| 8 |
| 27 |
| 2 |
| 3 |
(2)lg
4
| ||
| 7 |
| 4 |
| 3 |
| 3 |
| 2 |
| 5 |
(1)(
)
×(
)-1+4×(
)-
=
×10+4×(
)-2
=6+4×
=15.
(2)lg
-
lg2
+lg7
=lg(
÷2
×
×7
)
=lg
=
.
| 9 |
| 25 |
| 1 |
| 2 |
| 1 |
| 10 |
| 8 |
| 27 |
| 2 |
| 3 |
=
| 3 |
| 5 |
| 2 |
| 3 |
=6+4×
| 9 |
| 4 |
=15.
(2)lg
4
| ||
| 7 |
| 4 |
| 3 |
| 3 |
| 2 |
| 5 |
=lg(
4
| ||
| 7 |
| 3 |
| 2 |
| 4 |
| 3 |
| 5 |
=lg
| 10 |
=
| 1 |
| 2 |
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