数学破题36计 第4计 关羽开门 刀举成功
D1的中点,M、N分别是AE、CD1的中点,AD=AA1=a,AB=2a. (Ⅰ)求证:MN∥面ADD1A1; (Ⅱ)求二面角P—AE—D的大小; (Ⅲ)求三棱锥P—DEN的体积. [分析] 这是个长
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D1的中点,M、N分别是AE、CD1的中点,AD=AA1=a,AB=2a. (Ⅰ)求证:MN∥面ADD1A1; (Ⅱ)求二面角P—AE—D的大小; (Ⅲ)求三棱锥P—DEN的体积. [分析] 这是个长
________ hurt my foot. 8. (1分) In a________lesson,we add and add(加了又加). 七、 选出下列各组单词中画线部分发音不同的选项。 (共1题;共4分) 9.
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orchestra performance? Step 5 Homework 1.Try to add more words to each of the categories in Part B. 2.Get
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believe predestination is truly exist, and i always add some colurs of emotions。 it does not mean that i’m
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