Current location - Training Enrollment Network - Mathematics courses - On 20 13, my answer to question 24 of the senior high school entrance examination in Taian was 67.5, but the answer was 7 1.4. What should I do?
On 20 13, my answer to question 24 of the senior high school entrance examination in Taian was 67.5, but the answer was 7 1.4. What should I do?
CB=50*0.5=25 nautical miles, crossing D is the vertical line of AB, crossing AB in E, and CE=25+AB/2.

CEtg30 =DE=AB/2

That is, ab/2 = (25+ab/2) tg30.

1.7AB=50+AB

AB=50/0.7=7 1.4 nautical mile.