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计算:(1)3log39-0.1-1-823;(2)log220-log25+log23•log34;(3)(lg5)2+lg2•lg50.
题目详情
计算:
(1)3log39-0.1-1-8
;
(2)log220-log25+log23•log34;
(3)(lg5)2+lg2•lg50.
(1)3log39-0.1-1-8
2 |
3 |
(2)log220-log25+log23•log34;
(3)(lg5)2+lg2•lg50.
▼优质解答
答案和解析
(满分12分)
(1)3log39-0.1-1-8
=6-10-4
=-8.
(2)log220-log25+log23•log34
=log24+
×
=2+2=4.
(3)(lg5)2+lg2•lg50
=(lg5)2+lg2(lg2+2lg5)
=(lg5)2+2lg2lg5+(lg2)2
=(lg5+lg2)2
=1.
(1)3log39-0.1-1-8
2 |
3 |
=6-10-4
=-8.
(2)log220-log25+log23•log34
=log24+
lg3 |
lg2 |
lg4 |
lg3 |
=2+2=4.
(3)(lg5)2+lg2•lg50
=(lg5)2+lg2(lg2+2lg5)
=(lg5)2+2lg2lg5+(lg2)2
=(lg5+lg2)2
=1.
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