For integers a, B, C, D, the symbol ∣ A / D - B / C ∣ denotes the operation AC – BD. given that 1 ∣ 1 / D - B / 4 ∣ 3, what is the value of B + D?

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• 1. Two kinds of operations are defined, i.e. "0" and "0". For any two integers, a, B, a, B = a + B-1, a, B = a * B-1, the I'm not allowed to finish the title : (1) the value of 4 0 [(16 ￣ 8) ￣ (3 ￣ 5)] (2) If x [
• 2. For any two integers, a "+" B = a + B-1, a "×" B = axb-1, Find the value of 4 "×" [(6 "+" 8) "+ (3" × "5)]
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• 5. The four numbers a, B, C and D are arranged in two rows and two columns, and a vertical line is added on each side to mark them as ABCD. Adcb = ad BC is defined, The four numbers a, B, C and D are arranged in two rows and two columns, and a vertical line is added on each side to mark them as | a B |, which is defined as | a B | = ad BC, The above notation is called a determinant of order 2 |x+1 x-1| |1-x x + 1 | = 6, then x= By the way, how did you get it
• 6. Xiao Ming, his father and his mother are playing on the seesaw. Their weight is 150kg. His father is sitting on one end of the seesaw. Xiao Ming, who weighs only half of his mother, is sitting on the other end of the seesaw with his mother. At this time, his father's end is still on the ground. Can you guess what range Xiao Ming's weight should be?
• 7. Xiao Ming, his father and his mother are playing on the seesaw. Their weight is 150kg. His father is sitting on one end of the seesaw. Xiao Ming, who weighs only half of his mother, is sitting on the other end of the seesaw with his mother. At this time, his father's end is still on the ground. Can you guess what range Xiao Ming's weight should be?
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• 10. The point representing an integer on the number axis is called integral point. The unit length of a certain number axis is 1cm. If a line segment AB with length of 2010cm is drawn randomly on the number axis, the integral point covered by the line segment AB is () A. 2009 B. 2010 C. 2010 or 2009 D. 2010 or 2011
• 11. If the tolerance of arithmetic sequence an is - 1 and a1 + A2 + a3 +... + A2008 = 5022, then A2 + A4 + A6 +... + A2008 =?
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• 16. The cross section of a section of Zhanghe reservoir dam is isosceles trapezoid, the width of dam crest is 6m, the width of dam bottom is 126m, the slope gradient is 1: root 3, then the slope angle and height of the dam here are?
• 17. The cross section of the reservoir dam is trapezoidal, the width of the dam crest is 5m, the slope ad = 6 √ 2m, the dam height is 6m, and the slope of the oblique wave bc i = 1: √ 3, Calculate the low width ab of the dam and the slope angle ∠ a of the slope ad
• 18. In the trapezoid ABCD, ad ‖ BC, angle a = 90 °, ab = 7, ad = 2, BC = 3, whether there is a point P on the straight line AB, and find out the length of AP In the trapezoidal ABCD, ad ‖ BC, ∠ a = 90 °, ab = 7, ad = 2, BC = 3, ask whether there is a point P on the line AB, so that the triangle with P, a, D as the vertex is similar to the triangle with P, B, C as the vertex? If not, please explain the reason; if so, how many p points are there? And calculate the length of AP
• 19. There are four digits ABCD, and ABCD = (AB + CD) square, find all such four digits
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