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• 1. How to press dash on computer keyboard
• 2. The circumference of the rectangle is 24 cm, the ratio of length to width is 2:1, and the area of the rectangle is 2______ ．
• 3. Find the range of the real number m so that the two X1 and X2 of the equation x2-2 (m-1) x + 3m-6 = 0 satisfy the following conditions: X1 > 2, X2 > 2 Find the range of real number m, so that the two X1 and X2 of equation x2-2 (m-1) x + 3m-6 = 0 satisfy the following conditions: X1 > 2, X2 > 2, but the answer given by the teacher is - 1 < m < 2
• 4. 1. How to add or subtract 2, 3, 4, 5, 6, 7 to make it equal to 11
• 5. What is 8 and 3 / 8 minus 3 and 1 / 15
• 6. On the roots of equations and zeros of functions If the square-x-1 = 0 of equation 2aX has exactly one solution in (0,1), then what is the value range of a?
• 7. 8. 7 + x = 14 to solve the equation
• 8. How to solve the equation 50 + x = 3x
• 9. If there are only three positive integer solutions to the inequality 2x-m ≤ 0, then the range of M is?
• 10. Given that point a (- 3,2a-1) and point B (B, - 3) are symmetric with respect to the origin, what is the coordinate of the symmetric point P 'of point P (a, b) with respect to the y-axis?
• 11. The diameter of circle a is 10 cm, which is 50% of the diameter of circle B. what is the circumference of circle B Come on, come on
• 12. Given that the generatrix length of the cone is 30, and the center angle of the fan-shaped circle is 120 ° after the side expansion, the bottom radius of the cone is 0______ Detailed explanation
• 13. Use a square whose side length is a centimeter to make a square
• 14. The sides of the two squares are 4cm and 8cm respectively, and the area of the shadow is___ square centimetre There is no picture
• 15. Given the line I: y = 3x + 3, the equation of the line x-y-2 = 0 with respect to the l-symmetric line is obtained From x-y-2 = 0 and 3x-y + 3 = 0, x = - 5 / 2, y = - 9 / 2 Then three straight lines intersect at the point: (- 5 / 2, - 9 / 2) Let the linear equation be y + 9 / 2 = K (x + 5 / 2) The angle from the straight line x-y-2 = 0 to the straight line 3x-y + 3 = 0 is equal to the angle from the straight line 3x-y + 3 = 0 to the straight line (3-1)/(1+3),=(K-3)/(1+3k) So, k = - 7 So the linear equation is: 7x + y + 22 = 0 Why is the angle from the straight line x-y-2 = 0 to the straight line 3x-y + 3 = 0 equal to the angle from the straight line 3x-y + 3 = 0 to the straight line (3-1)/(1+3),=(K-3)/(1+3k)
• 16. If point E is the midpoint of BC and point F is the midpoint of AD, then the angle between AB and EF is 45?
• 17. Given rectangle ABCD, where AB = 5, BC = 8, AE ‖ BD, trapezoid ABDE, find the area of triangle BDE It's a rectangle ABCD with a triangle ade on it,
• 18. Fold one side of rectangle ABCD along de so that point C falls at point F on the edge of ab. if ad is equal to 8 and the area of triangle is 60, calculate the area of triangle Dec
• 19. As shown in the figure, in the rectangular ABCD, AC is a diagonal, rotate ABCD clockwise 90 ° around point B to gbef position, h is the midpoint of eg, if AB = 6, BC = 8, then the length of segment ch is () A. 25B. 21C. 210D. 41
• 20. As shown in the figure, the rectangle ABCD rotates 90 ° clockwise around point a to the position of rectangle ab1c1d1. Ad = 10, calculate the area swept by edge BC