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F.3 parallelogram.
2008-06-15 5:21 am
回答 (1)
2008-06-15 8:06 am
✔ 最佳答案
let BP = x m tan 50 = h / x
h =x tan50
tan 30 = ( 8+h ) / (120+x)
tan 30 = ( 8 + x tan50) / (120+x)
x = 99.74
h = 119 m
answer is B
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