1. If a - (- 2) = - 5, what is the value of a? If / 2x-3 / + / 3Y + 2 / = 0, then X-Y =?

1. If a - (- 2) = - 5, what is the value of a? If / 2x-3 / + / 3Y + 2 / = 0, then X-Y =?

∵|2x-3|≥0
|3Y+2|≥0
The solution is: x = 1.5
y=-2/3
∴x-y=1.5+2/3
=13/6

There was a blind man who put six baskets of watermelons into a triangle and sat in the middle. There were 24 watermelons in total, nine in each row. He touched them once a day. As long as there were nine watermelons in three baskets in each row, he was relieved. Unexpectedly, his neighbor ergazi had a joke with him. On the first day, he stole six watermelons, and on the second day, he stole three watermelons, But the blind man didn't find out. What's the matter?
①
⑦ ⑦
① ⑦ ①

Day 1: 3
3 3
3 3 3
Day 2: 4
1 1
4 1 4

1. For three consecutive integers, if an even number in the middle is 2n (n is a natural number), then its two numbers are expressed as (), and the sum of squares of these three consecutive integers is ()
3 3
2. When x = - 3, ax-bx = - 5, find the value of ax - BX + 3 when x = 3
3. The unit price of a book is x yuan, and the postage is 10% of the book price. When you buy y books, write the algebraic formula of the book payment, and calculate the book payment when x = 10 and y = 6

1,2n-1 2n+1
Sum of squares: 12n ^ 2 + 2
Question 2 equals 8
When x = - 3, then by bringing in ax-bx = - 5, - 3 (a-b) = - 5, we can get A-B = 5 / 3
Similarly, the value 3 (a-b) + 3 of ax-bx + 3 brings A-B in
three
3 total price q = XY + 10% XY
X = 10, y = 6
Q=66

（-1 1/2）+（- 1/6）= （-1 1/2）+（-2/3）= （-3.4）+4
（-1 1/2）+（- 1/6）=
（-1 1/2）+（-2/3）=
（-3.4）+4.3=
（-1 1/4）+（+1.25）=

-17/3
-37/3
zero point nine
-2/3

It is known that a (- 2,3), B (3,1) and P are on the x-axis. If the length of PA + Pb is the smallest, then the minimum is___ If the length of pa-pb is the largest, the maximum value is___ ．

(1) Find the minimum value: as shown in the figure: make the symmetric point B 'of point B about the X axis, connect ab', intersect the X axis at the point P, ∵ B and B 'symmetries, ∵ Pb = Pb ′, ∵ AP + BP = PA + B' P. according to the shortest line segment between the two points, we can know that point P is obtained. ∵ known a (- 2,3), B (3,1), ∵ B 'coordinates are (3, - 1)

1 / 2 ／ 1 / 3 × (1 / 4-1 / 6) what can be calculated simply should be calculated simply

If the side area of the cone is 15 π cm2 and the length of the generatrix is 5cm, its height is______ cm．

Let the radius of the circle at the bottom of the cone be r. according to the meaning of the question, we get 12.5.2 π r = 15, and the solution is r = 3, so the height of the cone is 52 − 32 = 4 (CM)

There are 8 numbers, of which 6 are: 0.51 (51 cycle), 2 / 3, 5 / 9, 0.51 (1 cycle), 24 / 47, 13 / 25, in the order from small to large
There are 8 numbers, of which 6 are: 0.51 (51 cycle), 2 / 3, 5 / 9, 0.51 (1 cycle), 24 / 47, 13 / 25. If the fourth number is 0.51 (1 cycle) in the order from small to large, which one is the fourth number in the order from large to small

According to the known condition "if the order from small to large, the fourth number is 0.51 (1 cycle)", one of the two unannounced numbers is 0.51 (51 cycle) and 0.51 (1 cycle)

Given the circle x ^ 2 + y ^ 2-2x + 2Y + 1 = 0, point a (- 3,0), the tangent equation of the circle passing point a is solved

Y circle: (x-1) &# 178; + (y + 1) &# 178; = 1;
The radius of center (1, - 1) is 1;
Let the tangent be K (x + 3) = y, that is, kx-y + 3K = 0;
The distance from the center of the circle to the tangent = | K + 1 + 3K | / √ (K & # 178; + 1) = 1;
|4k+1|/√(1+k²)=1;
(4k+1)²=1+k²;
16k²+8k+1=1+k²;
15k²+8k=0;
K = 0 or K = - 8 / 15;
So the tangent is y = 0 or - 8x / 15-y-8 / 5 = 0;
If you don't understand this question, you can ask,

Known 0

The coordinates of intersection point can be obtained from the equations composed of two straight lines L1: ax-2y = 2a-4,: L2: 2x + A * 2Y = 2A * 2 + 4
To minimize the area, the positive intercept between the two lines and the XY axis is the smallest
Intercept of L1: ax-2y = 2a-4 and X axis