As shown in the figure, a vegetable farmer builds a plastic greenhouse. If the width of the greenhouse is a = 4m, the height is b = 3M, and the length is d = 35m, the area of the plastic film covering the top is m ^ 2

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• 2. Schematic diagram of lever principle in push up Push up is a hard lever, please draw the arm and fulcrum, dynamic resistance
• 3. Try to discuss the application of Maslow's hierarchy of needs theory in management
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• 5. In RT triangle ABC, angle c = 90 degrees, angle a = 45 degrees, and ab = 8 AC.BC
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• 11. In △ ABC, ad, be and CF are bisectors of three internal angles respectively, which intersect at O and og ⊥ BC, and the perpendicular foot is g Same topic
• 12. In the triangle ABC, AB > AC, AF is the angle bisector, D is the point on AB and ad = AC, de ‖ BC intersects AC at e to prove the angle EDF of CD bisector
• 13. How to find a and B
• 14. A minimalist fraction, expand its numerator by three times, reduce its denominator by two times, and it becomes 92. Can you find out what the original minimalist fraction is?
• 15. Solving a big problem of triangle and vector in Mathematics Let a = (SiNx / 2, root 3cosx / 2) and B = (cosx / 2, cosx / 2). Let f (x) = a · B (1) Find the zero point of function f (x) on [0,2] () let the opposite sides of △ ABC inner angles a, B and C be a, B and C respectively, and f (a) = root 3 If you're not finished, add: B = 2, Sina = 2sinc, find the value of C
• 16. Solve the combination of triangle and vector It is known that a, B and C are the opposite sides of three internal angles a, B and C of Δ ABC, vector m (radical 3, - 1) and vector n (COSA, Sina). If vector m, vector N and acosb + bcosa = csinc, then angle B =?)
• 17. Solving triangle with vector In △ ABC, the opposite sides of angles a, B and C are a, B, C and Tanc = 3 times the root sign 7, so COSC can be obtained
• 18. A problem of solving the combination of triangle and vector In the triangle ABC, h is perpendicular, the dot product of vector BH and vector BC is 6, the sum of squares of sina and sinc = the square of SINB + Sina * sinc Find: (1) angle B (2) When the radius of circumcircle r of triangle ABC is the smallest, the shape of triangle ABC can be judged
• 19. High school mathematics vector inequality synthesis Given the vector a = (y, x + 5), B = (y, x + 5), x > 0, Y > 0, and a is perpendicular to B, what is the minimum value of XY Change a = (4-x, 1)
• 20. It's almost the first semester of senior high school. We need to learn compulsory five in Mathematics: solving triangles, sequence of numbers and inequality. How much do these have to do with compulsory one?