题目内容
计算:
(1)已知x>0,化简(2x
+3
)(2x
-3
)-4x-
(x-x
)
(2)log2.56.25+lg
+ln
+21+log23.
(1)已知x>0,化简(2x
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| 4 |
| 3 |
| 2 |
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| 4 |
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(2)log2.56.25+lg
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| 100 |
| e |
(1)(2x
+3
)(2x
-3
)-4x-
(x-x
)
=(2x
)2-(3
)2-4x-
•x+4x-
•x
…(3分)
=4x
-33-4x
+4…(5分)
=-23.…(6分)
(2)log2.56.25+lg
+ln
+21+log23=log2.52.52+lg10-2+lne
+2×2log23…(9分)
=2-2+
+2×3 …(12分)
=6
.…(13分)
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=(2x
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=4x
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=-23.…(6分)
(2)log2.56.25+lg
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| 100 |
| e |
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=2-2+
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=6
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