![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
It is known that: as shown in the figure, a point P, P1 and P2 in ∠ AOB are respectively symmetrical points about OA and ob. P1p2 intersects OA with m and ob with N. if p1p2 = 5cm, then the perimeter of △ PMN is () A. 3cmB. 4cmC. 5cmD. 6cm
∵ P and P1 are symmetrical with respect to OA, ∵ OA is the vertical bisector of line segment PP1, ∵ MP = MP1. Similarly, P and P2 are symmetrical with respect to ob, ∵ ob is the vertical bisector of line segment PP2, ∵ NP = NP2, ∵ p1p2 = p1m + Mn + NP2 = MP + Mn + NP = 5cm, then the perimeter of △ PMN is 5cm
As shown in the figure, there is a point P in the angle AOB, which makes the symmetrical points P1 and P2 of P with respect to OA and ob respectively, connecting p1p2 to OA at M and ob at n. when the angle AOB = 25 degrees, calculate the degree of angle p1pp2
The four points of ∵ o, P1, P and P2 are in the same circle, and ∵ p1pp2 = 130 degree
It is known that: as shown in the figure, a point P, P1 and P2 in ∠ AOB are respectively symmetrical points about OA and ob. P1p2 intersects OA with m and ob with N. if p1p2 = 5cm, then the perimeter of △ PMN is ()
A. 3cmB. 4cmC. 5cmD. 6cm
∵ P and P1 are symmetrical with respect to OA, ∵ OA is the vertical bisector of line segment PP1, ∵ MP = MP1. Similarly, P and P2 are symmetrical with respect to ob, ∵ ob is the vertical bisector of line segment PP2, ∵ NP = NP2, ∵ p1p2 = p1m + Mn + NP2 = MP + Mn + NP = 5cm, then the perimeter of △ PMN is 5cm
1 × 1, 2 × 3, 3 × 5, 5 × 8, [] × [], [] × [], multiply by several, find the rule
8x13,13x21
Rabbit series product
Each factor is the sum of the first two factors
Find the rule 1 + 2 + 3 = () multiply () 1 + 2 + 3 + 4 = (() + ()) multiply () 2
1 + 2 + 3 = (2) times (3) 1 + 2 + 3 + 4 = ((2) + (3)) times 2
Solution equation: 4 (x-1) + 6 (3-4x) = 7 (4x-3)
4x-4+18-24x=28x-21 x=35/48
Solving equation: 4 (x-1) + 6 (3-4x) = 7 (4x-3) with two different solutions, which one is easier?
Original formula = 4 (x-1) - 6 (4x-3) = 7 (4x-3) 4 (x-1) = 7 (4x-3) + 6 (4x-3) 4 (x-1) = 13 (4x-3) 4x-4 = 52x-3952x-4x = 39-448x = 35x = 35 / 48 original formula = 4x-4 + 18-24x = 28x-2128x + 24x-4x = 18-4 + 2148x = 35x = 35 / 48 the first solution is simpler
Solving the equation 3 / 4x = X-1 / 2 is not much negative!
3/4X=X-1/2
Solution 3 / 4x-x = - 1 / 2
-1/4x=-1/2
x=-1/2*（-4）
x=2
5 * x = 10.5
3.5x=10.5
x=10.5÷3.5
x=3
How to solve the equation of 1.9x + 0.4x = 9.2
1.9x+0.4x=9.2
2.3x=9.2
x=4
RELATED INFORMATIONS
- 1. It is known that: as shown in the figure, a point P, P1 and P2 in ∠ AOB are respectively symmetrical points about OA and ob. P1p2 intersects OA with m and ob with N. if p1p2 = 5cm, then the perimeter of △ PMN is () A. 3cmB. 4cmC. 5cmD. 6cm
- 2. It is known that there is a point P (- 2,1) on the inverse scale function image, and the intersection coordinates of the image and the line y = 2x-5 are obtained Come on!
- 3. Let x belong to {0, π / 2}. F (x) = sin (cosx), G (x) = cos (SiNx) find the maximum and minimum of F (x) and G (x)
- 4. Y = sin | x | is an even function with a period of 2 π
- 5. Is the function f (x) = sin [π / 2 (x-3)] odd or even? And then why?
- 6. Calculation equations: 14x + 3Y = 24, 3x-5y = 39
- 7. If the function y = sin (1 / 2x-q) is even, then one value of Q is
- 8. It is known that the function f (x) is an even function defined on the interval [- 2,2]. When x belongs to [0,2], f (x) is a decreasing function if the inequality f (1-m) is less than f (m) Find the value range of M
- 9. Given that cos2x = - 7 / 8, X belongs to (π / 2, π), find the value of sin (x + π / 6) - sin2x Cos2x = 7 / 8 wrong number
- 10. Cos2x / sin (x + 45 °) = 1 / 2, then what is sin2x equal to
- 11. A bug landed at a certain point on the number axis, P0. For the first time, it jumped 1 unit to the left from P0 to P1. For the second time, it jumped 2 units to the right from P1 to P2. For the third time, it jumped 3 units to the left from P2
- 12. The first time, it jumps one unit to the left from P0 to P1. The second time, it jumps two units to the right from P1 to P2. The third time, it jumps three units to the left from P2 to P3. The fourth time, it jumps four units to the right from P3 to P4 When it jumps 100 times according to the above rule, the number represented by P100 on the number axis is exactly 2062. Find the number represented by P0, the initial position of the insect
- 13. A bug landed at a point P0 on the number axis. For the first time, it jumped 1 unit to the left from P0 to P1, and for the second time, it jumped 2 units to the right from P1 to P2, Jump 3 units from P2 to P3 for the third time, and jump 4 units from P3 to P4 for the fourth time. After jumping 100 times according to the above rule, it falls at P100 on the number axis, and the number represented by P100 is exactly 2003. What is the number represented by P0?
- 14. A metal block, put in the liquid with density P1, measure weight G1 with spring scale, put in the liquid with density P2, calculate the liquid density I already know: Suppose the density p and volume V of the metal block p1Vg+G1=pVg p2Vg+G2=pVg Solution V=(G1-G2)/(p1g-p2g) But how to get "P = (g1p2-g2p1) / (g1-g2)" from the formula of V?
- 15. In the rectangular coordinate system, there is a point column P1 (A1, B1). PN (an, BN). For every positive integer n, the point PN is on the image of function y = log3 (2x), The point PN, the point (n-1,0) and the point (n, 0) form an isosceles triangle with PN as the vertex. The expression of the ordinate BN of the point PN is obtained
- 16. What quadrant does the image of a linear function y = negative 3x plus 2 pass through?
- 17. The ordinate of a point a of the image with positive scale function y = x and inverse scale function y = K / X is 3; (2) Are there any other points except point a in the image of positive scale function and inverse scale function? If so, please write the coordinates of the intersection point
- 18. Given that the ordinate of the intersection of the image of a certain function and the Y axis is - 1, and when x = 3, y = - 4, what is the expression of this function?
- 19. If the distance between the image of the linear function y = KX + 6 and the two intersections of the coordinate axis is 10, then the value of K is 0
- 20. If the image of a linear function passes through point a (- 2, - 1) and is parallel to the line y = 2x-1, the analytic expression of the function is?