How to put the pieces of Lesson 16 in the middle of nine squares so that the sum of the pieces on each side is 7
Five in the upper left and lower right, one in the other, not in the middle
RELATED INFORMATIONS
- 1. Prove that the image of y = x + 1 / (x-1) is a centrosymmetric graph, and find its symmetry center. Find the process. Thank you
- 2. It is known that the sum of the right sides of a right triangle is equal to 8. What is the maximum area of the right triangle when the two right sides are equal to each other?
- 3. In the triangular pyramid p-abc, PA is perpendicular to the plane ABC, ∠ BAC = 60 °, PA = AB = AC = 2, and E is the midpoint of PC The cosine of the angle between AE and Pb and the volume of a-ebc are calculated
- 4. The bottom of a trapezoid is 8 cm. If the upper bottom is extended by 6 cm, the area will be increased by 9 square cm and become a parallelogram. Then the area of the original trapezoid is smaller
- 5. It is known that △ ABC ∽ a ′ B ′ C ', the difference of their perimeter is 20, and the area ratio is 4:1. The perimeter of △ ABC and △ a ′ B ′ C' can be calculated
- 6. Imagination composition
- 7. Step into the new curriculum page 120-122 emergency
- 8. A construction site digs a rectangular foundation and draws it on the plan with a scale of 1:2000. The length is 6cm and the width is 4cm. What is the area of this foundation?
- 9. Mathematical problems (solving linear equation with one variable) Xiaoming's telephone number is 7 digits, the first four digits are 6798, and the last three digits are three consecutive integers from small to large, and the sum of these three digits is twice the last digit
- 10. According to the design requirements, the distance between the transmission tower P and two towns a and B must be equal, and the distance between the transmission tower P and two expressways m and N must also be equal. Please make the location of the transmission tower P in the drawing. (ruler drawing, do not write the method, keep the trace of drawing.)
- 11. Given the quadratic function, when x = 4, there is a minimum value of - 3, and the abscissa of the intersection of his image and X axis is 1, the relationship of the quadratic function is obtained
- 12. Points E and F are the midpoint of AD and DC on square ABCD, respectively. Be and CF intersect at point P, and AP = AB is proved It requires a vector solution
- 13. Please ask about proving Newton Leibniz formula Proof: let the upper limit be a variable, define a new function g [x], prove G '(x) = f (x), and then say g (x) C = f (x), but doesn't g (x) = f (x) C also hold?
- 14. On the derivation of half angle formula TaNx / 2 = under positive and negative root sign (1-cosx) / (1 + cosx) = (1-cosx) / SiNx Why is there no positive or negative in the last step
- 15. Given the function f (x) = cos π X & nbsp; & nbsp; & nbsp; (x ≤ 0) f (x-1) + 1 & nbsp; & nbsp; (x > 0), then f (43) + F (- 43) =___ .
- 16. It is proved that XLN [(1 + x) / (1-x)] + cos x is greater than or equal to 1 + (x ^ 2) / 2 when (- 1 + x) / (1-x)]
- 17. To prove sin1 / [Cosn ° * cos (n + 1) °] = Tan (n + 1) ° - Tan °
- 18. Can (COS π / 4 + isin π / 4) ^ n be expressed as (Cosn π / 4 + Sinn π / 4)? Why? Here I ^ 2 = - 1
- 19. Verification: cos α + √ 3 · sin α = 2Sin (π / 6 + α). Need detailed process, thank you
- 20. The n-th root of non-zero complex R (COS θ + isin θ) is n complex numbers Is this something for Shanghai college entrance examination?