1)In the figure, angle ABC=angle ADB=90 and ADC is a straight line. Find BD.
picture:http://postimg.org/image/bfx0f7m3z/d4f31265/
2)If 4^(2x)=8^2012, then x=
A 1006 B 1509 C 2012 D 4024
maths problem
2014-05-06 9:35 pm
回答 (2)
2014-05-06 10:23 pm
✔ 最佳答案
From the graph,AB=2 and BC=1tan BAD=1/2
BAD=26.5651(4.d.p)
BD=2sinBAD=sqrt(4/5)=(2sqrt5)/5
____________________________________
4^(2x)=8^2012
2^4x=2^6036
4x=6036
x=1509
Ans:B
2014-05-09 4:39 am
Ans:B 1509
4^(2x)=8^2012
2^4x=2^6036
4x=6036
x=1509
4^(2x)=8^2012
2^4x=2^6036
4x=6036
x=1509
收錄日期: 2021-04-20 15:11:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140506000051KK00078