Finding indefinite integral e ^ X / xdx

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• 15. As shown in the figure, it is known that in △ ABC, ab = AC, ad is the square line of ∠ BAC, AE is the square line of the outer corner of ∠ BAC, CE is perpendicular to point E, wait online for 5 minutes, high score As shown in the figure, it is known that in △ ABC, ab = AC, ad is the square line of ∠ BAC, AE is the square line of the outer corner of ∠ BAC, and CE is perpendicular to point E (1) The quadrilateral adce is a rectangle (2) Quadrilateral ABDE is parallelogram
• 16. It is known that points D, e and F are marked on each side AB, BC and Ca of triangle ABC such that AD / BD = be / CE = CF / AF = 1 / N. find the ratio of triangle def to triangle ABC (omitted, it's the ratio of their area) need to solve the problem process
• 17. As shown in the figure, in △ ABC, ∠ a = 50 ° AB = AC, and the vertical bisector De of AB intersects AC at D, then the degree of ∠ DBC is () A. 15°B. 20°C. 30°D. 25°
• 18. As shown in the figure, in △ ABC, the vertical bisector of ∠ C = 90 ° AB intersects AC at D, and the perpendicular foot is e. if ∠ a = 30 ° de = 2, the degree of ∠ DBC is______ The length of CD is______ ．
• 19. In △ ABC, ad bisects ∠ BAC ∠ C ＞ B to prove 1) ∠ ADC = 90 ° - 1 / 2 (∠ C - ∠ b) 2) ∠ ADC = 1 / (∠ ACE + ∠ b)
• 20. In △ ABC, ab = AC, ∠ BAC = 120 °, the vertical bisector of AB intersects BC at D, and BD = 10cm, then DC=_________ .