Given the set a = {(x, y) | X's Square - 2x + Y's Square "0}, B = {(x, y) | y, x + a}, if a intersects B = a, then the value range of a is As fast as the title It's a mistake,

Given the set a = {(x, y) | X's Square - 2x + Y's Square "0}, B = {(x, y) | y, x + a}, if a intersects B = a, then the value range of a is As fast as the title It's a mistake,

A intersection B = a; that is, there is no intersection between a and B, and Y ″ x + a ″ is in the square of X - 2x + y ″ 0
Below;
A "radical 2 + 1;
finished!

The square of (2x-1) = (- 4) is the value of X

The square of (2x-1) = (- 4)
2x-1 = 4 or 2x-1 = - 4
2X = 5 or 2x = - 3
X = 2.5 or x = - 1.5

Given the quadratic power of X - 2x = 1, find the value of (x-1) (2x + 1) - x (x + 1)

（x-1)(2x+1)-x(x+1)
=2X2-X-1-X2-X
=X2-2X-1
Substituting x2-2x = 1
X2-2X-1=0

My question is x + 1 / 6x = 4 X-2 / 7X = 3 / 4 3x + 3 / 4x = 7 1 / 2 (7 and 1 / 2)
5 1 / 4x = 7 + 1 / 2 plus explanation
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Method 1
(1)7/6X=4——X=4*6/7——X=24/7
(2)5/7X=3/4——X=7/5*3/4——X=21/20
(3)15/4X=15/2——X=4/15*15/2——X=2
(4)21/4X=15/2——X=15/2*4/21——X=10/7
Method 2
1) x+1/6x=x(1+1/6)=x(6/6+1/6)=7/6x=4 x=4 * 6/7 =24/7=3 3/7
(2) x-2/7x=5/7x=3/4 x=21/20
(3) 3x+3/4x=15/4x=15/2 x=2
(4) 21/4x=15/2 x=15/2 * 4/21=30/21=10/7

Solving equations and vertical exercises in grade five
For the VIP education board, the total number of the two should not be less than 500. It's a little more difficult. You can use brackets (at most one bracket) without brackets. The number should be within 50. I beg you, I'll give you a reward of 30, and I'll have 30 left

3X+5X=48 14X-8X=12 6*5+2X=44
20X-50=50 28+6X=88 32-22X=10
24-3X=3 10X*（5+1）=60 99X=100-X
X+3=18 X-6=12 56-2X=20
4y+2=6 x+32=76 3x+6=18
16+8x=40 2x-8=8 4x-3*9=29
8x-3x=105 x-6*5=42 x+5=7
2x+3=10 12x-9x=9 6x+18=48
56x-50x=30 5x=15 78-5x=28
32y-29=3 5x+5=15 89x-9=80
100-20x=20 55x-25x=60 76y-75=1
23y-23=23 4x-20=0 80y+20=100
53x-90=16 2x+9x=11 12y-12=24
80+5x=100 7x-8=6 65x+35=100
19y+y=40 25-5x=15 79y+y=80
42x+28x=140 3x-1=8 90y-90=90
80y-90=70 78y+2y=160 88-x=80
9-4x=1 20x=40 65y-30=100
51y-y=100 85y+1=-86 45x-50=40

Fang Liang has 22.8 yuan. After he bought 4 kg of apples, he still has 2.8 yuan. How much is it per kg of apples

Set X yuan per kilogram of apples
4x+2.8=22.8
4x=22.8-2.8
4x=20
x=5
A: 5 yuan per kilogram of apples

Primary school sixth grade formula and equation total review test paper (volume a) 1. Basic knowledge (know) (30 points) question 7
The area of a triangle is s square centimeter, and the area of a parallelogram with the same base and height is (); if the height of a parallelogram is 5 cm, then its base is () cm

2S
2S÷5

What is the solution of the square root sign 2x-1 = 0 of equation 2x by formula method

a=2,b=-√2,c=-1
So △ = B & # 178; - 4ac = 2 + 8 = 10
So x = (√ 2 - √ 10) / 4, x = (√ 2 + √ 10) / 4

Find the intersection point and vertex coordinates of the function y = x ^ 2 + 2x + 3 and X axis

Vertex coordinate formula: (- B / 2a, (4ac-b ^ 2) / 4A)
(-1,2)
The intersection of x-axis: when y = 0, solve the equation
0=x^2+2x+3
△=4-12

If the parabola y = x2-2x-3 has three intersections with the two axes, the radius of the circumscribed circle passing through these three points is______ ．

Let the intersection of y = x2-2x-3 and Y axis be a, and the intersection of y = x2-2x-3 and X axis be B and C respectively, ∵ let x = 0, then y = - 3, ∵ a (0, - 3); ∵ let y = 0, then x2-2x-3 = 0, and the solution is x = 3 or x = - 1, ∵ B (3,0), C (- 1,0). Let the center of circumscribed circle passing through these three points be m (m, n), ∵ M2 + (...)