题目内容
(1)求值:64
-(-
)0+
+lg2+lg50+21+log23;
(2)求值:
.
| 1 |
| 3 |
| 2 |
| 3 |
| 3 | 125 |
(2)求值:
| tan80°-tan20°+tan(-60°) |
| tan80°tan20° |
(1)64
-(-
)0+
+lg2+lg50+21+log23=(43)
-1+(53)
+lg(2×50)+2×2log23=4-1+5+2+2×3=16.
(2)
=
=
=
.
| 1 |
| 3 |
| 2 |
| 3 |
| 3 | 125 |
| 1 |
| 3 |
| 1 |
| 3 |
(2)
| tan80°-tan20°+tan(-60°) |
| tan80°tan20° |
| tan(80°-20°)(1+tan80°tan20°)-tan(60°) |
| tan80°tan20° |
| ||
| tan80°tan20° |
| 3 |
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