函数超难练习卷子 球解析

问题描述:

函数超难练习卷子 球解析
21.计算
(1)log2.5 6.25+lg(1/100)+In√e+2^(log2 3)
(2)lg25+lg2l lg50+(lg2)^2
(3)(lg(1/4)-lg25)+100^-1/2
(4)(log3 2+log9 2)×(log4 3+log8 3)
(5)(0.027)^1/3-(1/7)^-2+(25/9)^1/2-((√2)-1)^0
(6)(lg2)^2+lg2 ×(lg5+log3 5)/(log3 10)

21.计算
(1)log2.5 6.25+lg(1/100)+In√e+2^(log2 3)
=2-2+1/2+3=7/2
(2)lg25+lg2 lg50+(lg2)^2
=lg25+lg2lg(100/2)+lg²2
=lg25 +lg2(2-lg2)+lg²2
=lg25+2lg2-lg²2+lg²2
=lg25+lg4=lg100=2
(3)(lg(1/4)-lg25)+100^-1/2
=(-lg4-lg25)+1/10
=-lg100+1/10=-2+1/10
(4)(log3 2+log9 2)×(log4 3+log8 3)
=[log(3)2+1/2log(3)2]×(1/2log(2)3+1/3log(2)3]
=3/2 [log(3)2]×5/6×log(2)3=3/2*5/6=5/4
(5)(0.027)^1/3-(1/7)^-2+(25/9)^1/2-((√2)-1)^0
=3/10-49+5/3-1 (后面你自己算吧)
(6)(lg2)^2+lg2 ×(lg5+log3 5)/(log3 10)
=(lg2)^2+lg2 ×(lg5+lg5/lg3)lg3
=(lg2)^2+lg2 ×(lg5lg3+lg5)
好奇怪,错了吧
6) (lg2)^2+lg2 ×lg5+log3 5/(log3 10)
=(lg2)^2+lg2 ×lg5+lg5/lg3*lg3
=(lg2)^2+lg2 ×lg5+lg5
=lg2(lg2+lg5)=lg5
=lg2+lg5=lg10=1