Mathematical Olympiad (Grade 5 Volume) Starting LineNo. 18 Talking about Cycle Issues (1) Thinking and PracticeNo. 10 (2) Who can teach me small questions?

(love c) stands for 1978, (number d) stands for 1979, indicating that 1978 group is (love c) and 1979 group is (number d).

The year 2006 will correspond to the 2006 group. Let's take a look at the above words first. The period of these words is 52006÷5 = 40 1... 1, so the word in 2006 is "I". Let's look at the letters below. The deadline for these letters is 4,2006 \

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As shown in the figure, point A is the perpendicular of MN, and point B is the vertical foot.

then what AB=AP×sin30 = 160×0.5=80m

∵? AB=80m< 100m

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