If a, B and C are the three sides of triangle ABC, and 3 (a square + b square + C Square) = (a + B + C) square, judge the shape of triangle ABC?

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• 1. In triangle ABC, if angle a + angle B = 2 angle c, angle a-angle C = 40 °, what triangle is it?
• 2. Send a 5-inch, 5.3-inch, 5.5-inch, 6-inch mobile phone comparison chart? I really don't know what size is
• 3. As shown in the figure, it is known that ∠ 1 + 2 = 180 ° and ∠ 3 = B. try to judge the relationship between ∠ AED and ∠ C, and rationalize the conclusion
• 4. Figure 1 is 9cm in length and 6cm in width, figure 2 is 3cm in length and figure 3 is 12cm in width
• 5. A gymnasium inlays the floor with rectangular wood blocks of the same size, and paves two blocks for the first time, as shown in Figure 1. The second time completely encloses the first time, as shown in Figure 2 and figure 3 The second paving is completely enclosed, as shown in Figure 3. In this way, after the nth paving, the letter N is used to indicate the number of wood blocks used in the nth figure
• 6. A passenger car and a train run in the same direction on parallel tracks. The length of a passenger car is 200 meters, and that of a freight car is 280 meters The speed of the bus is 1200 meters per second, and the speed of the train is 720 meters per second. How many seconds is the crossing time of the two trains? (solution of equation)
• 7. Two trains, passenger cars 200 meters long, 300 meters per second; freight cars 300 meters long, 20 meters per line, two cars in parallel track up into a few seconds later, passenger cars over freight cars
• 8. When m is the value, the quadratic equation MX2 + (m-1) x + M = 0 (1) If the solution set of the inequality MX2 + (m-1) x + m > 0 is r, the value range of M is obtained I think there is something wrong with the title.
• 9. Find the image of function y = x square + 1 / X (x is not equal to 0) Teach me the method
• 10. Simple algorithm of 36 + 18 × 37 + 19 × 36
• 11. In the triangle ABC, a, B and C are the opposite sides of ∠ a, B and C respectively. Try to compare the square of a-b-c and the square of 2BC
• 12. In the triangle ABC, if the lengths of three sides are a, B and C respectively, and the square of a + 2Ab = the square of C + 2BC, then the triangle ABC is a triangle
• 13. It is known that ABC is the length of three sides of a triangle. Try to compare the size of a square + b square + C square and 2BC
• 14. In triangle ABC, angle a = 108 degrees, angle c-angle B = 28 degrees, then angle C=
• 15. A = 2, CoSb = 3 / 5, C = 45 ° to find the area of triangle ABC Solving problems with cosine theorem
• 16. In △ ABC, a = 7, B = 43, C = 13, then the minimum angle is () A. π3B. π6C. π4D. π12
• 17. Three years ago, my father's age was five times that of Xiaoli. Five years later, my father's age is three times that of Xiaoli. How old is Xiaoli this year? I want the process of arithmetic! Besides, I don't know the quadratic equation of two variables!
• 18. Cut a cube with an edge length of 8 cm into two cuboids. What is the total surface area of the two cuboids?
• 19. What is the surface area of a cuboid made up of a square with three edges 8 cm long?
• 20. Divide a square with an edge length of 8 cm into two rectangles of the same size and shape. What is the surface area of each rectangle Such as the title One l