A mathematical problem combining function with inequality Here is the title It is known that P (a, b) is a point on the image with positive scale function y = 2x, and the distance between P and B (2. - 1) is no more than 3, so the value range of a is obtained The answer is: -2 / 5 radical 5

A mathematical problem combining function with inequality Here is the title It is known that P (a, b) is a point on the image with positive scale function y = 2x, and the distance between P and B (2. - 1) is no more than 3, so the value range of a is obtained The answer is: -2 / 5 radical 5

From the title, we can get: B = 2A and under the root sign [[b - (- 1)] ² + (A-2) ²]

Problems of binary linear equations in the first year of junior high school
30 questions of binary linear equations

28x+28y=3332
52x-y=4628
Answer: x = 89, y = 30
62x-98y=-2564
46x-y=2024
Answer: x = 44, y = 54
79x-76y=-4388
26x-y=832
Answer: x = 32, y = 91
63x-40y=-821
42x-y=546
Answer: x = 13, y = 41
69x-96y=-1209
42x+y=3822
Answer: x = 91, y = 78
85x+67y=7338
11x+y=308
Answer: x = 28, y = 74
78x+74y=12928
14x+y=1218
Answer: x = 87, y = 83
39x+42y=5331
59x-y=5841
Answer: x = 99, y = 35
29x+18y=1916
58x+y=2320
Answer: x = 40, y = 42
40x+31y=6043
45x-y=3555
Answer: x = 79, y = 93
47x+50y=8598
45x+y=3780
Answer: x = 84, y = 93
45x-30y=-1455
29x-y=725
Answer: x = 25, y = 86
11x-43y=-1361
47x+y=799
Answer: x = 17, y = 36
33x+59y=3254
94x+y=1034
Answer: x = 11, y = 49
89x-74y=-2735
68x+y=1020
Answer: x = 15, y = 55
94x+71y=7517
78x+y=3822
Answer: x = 49, y = 41
28x-62y=-4934
46x+y=552
Answer: x = 12, y = 85
75x+43y=8472
17x-y=1394
Answer: x = 82, y = 54
41x-38y=-1180
29x+y=1450
Answer: x = 50, y = 85
22x-59y=824
63x+y=4725
Answer: x = 75, y = 14
95x-56y=-401
90x+y=1530
Answer: x = 17, y = 36
93x-52y=-852
29x+y=464
Answer: x = 16, y = 45
93x+12y=8823
54x+y=4914
Answer: x = 91, y = 30
21x-63y=84
20x+y=1880
Answer: x = 94, y = 30
48x+93y=9756
38x-y=950
Answer: x = 25, y = 92
99x-67y=4011
75x-y=5475
Answer: x = 73, y = 48
83x+64y=9291
90x-y=3690
Answer: x = 41, y = 92
17x+62y=3216
75x-y=7350
Answer: x = 98, y = 25
20x-68y=-4596
14x-y=924
Answer: x = 66, y = 87
23x+87y=4110
83x-y=5727
Answer: x = 69, y = 29

If the distance from the moving point P to the fixed point F (1,0) on the plane is 1 greater than the distance from P to the Y axis, then the trajectory equation of the moving point P is ()
A. Y2 = 2xb. Y2 = 4xc. Y2 = 2x or y = 0 x ≤ 0 D. y2 = 4x or y = 0 x ≤ 0

Let P (x, y), the distance from P to fixed point F (1,0) be (x − 1) 2 + Y2, and the distance from P to y axis be | x |. When x ≤ 0, the trajectory of P is y = 0 (x ≤ 0); when x > 0, the distance from P to fixed point F (1,0) is greater than that from P to y axis by 1

Factorization of 1 + A + B + 1 / 4 (a + b) ^ 2

1+a+b+1/4(a+b)^2
=1^2+2*1/2*(+b)+((a+b)/2)^2
=((a+b)/2+1)^2

If there are five Saturdays and Sundays in August, what day is the first day of this month?
Calculation formula

Sunday

We should explain the reason and formulate the formula
1、 Fill in the blanks: 1. If a + 1 and - B are mutually opposite numbers, then a = () 2. If M is an integer greater than 1, then the size relationship of - m, - 1 / m, - M is () 3. The rational number whose absolute value is 10 is () 4. The absolute value of two mutually opposite numbers () 2. Simplification: 1. - | + (- 1 / 2) = () 3.1

1.a+1=-(-b)
a=b-1
2.-m

Known 2002 New Year's Day is Tuesday. Ask 2008 New Year's Day is a week?

From 2002 to 2007, 365 days (365 + 365 + 366 + 365 + 365 + 365) / 7 = 313. New Year's day in 2008 is Tuesday

What are all the mathematical formulas from grade one to grade six

There is a pocket card specially bought in the bookstore, which is very complete

What is the result of multiplying 8 yuan and 5 fen by 6

48 yuan triangle

The shadow of the 8-meter-long pole AB falls on the slope CD and the ground BC. The measured results show that CD = 8 cm, BC = 28 cm, and the angle between the slope CD and the ground is 30 degrees. If there is no slope, what is the shadow length of the pole on the horizontal plane?

The BF was the shadow length when extending the extension line of AD and BC and F
According to the meaning of the title, the angle between Cd and the ground is 30 degrees, so de = 4, CE = 4 times radical 3, so be = 28 + 4 times radical 3
Because de = 4. AB = 8, De is the median line
So BF = 2be = 56 + 4 times root 3