Given the square of X - 13X + 36 = (x + a) (x + b), then the value of AB is

Given the square of X - 13X + 36 = (x + a) (x + b), then the value of AB is

The square of X - 13X + 36 = (x + a) (x + b),
x²-13x+36=(x-4)(x-9)=(x+a)(x+b)
∴ab=(-4)*(-9)=36

Given (x + a) (x + b) = x2-13x + 36, then the value of a + B is ()
A. 13B. -13C. 36D. -36

(x + a) (x + b) = x2 + (a + b) x + AB, and ∵ (x + a) (x + b) = x2-13x + 36, so a + B = - 13

Given (x + a) (x + b) = x2-13x + 36, then the value of a + B is ()
A. 13B. -13C. 36D. -36

(x + a) (x + b) = x2 + (a + b) x + AB, and ∵ (x + a) (x + b) = x2-13x + 36, so a + B = - 13

The first question of yongzhenben 32
A. B is 300 kilometers away. A and B start from a to B at the same time. A takes half the time to walk at the speed of 30 kilometers per hour, and the other half at the speed of 50 kilometers per hour. B takes half the distance at the speed of 30 kilometers per hour, and the other half at the speed of how many kilometers per hour, so they can reach B at the same time?

If the average speed of a is (30 * t / 2 + 50 * t / 2) / T = 40km / h, then the average speed of B is 150 / (7.5-150 / 30) = 60km / h

I'm in a hurry. I'm in a hurry. I'm in a hurry. I'm in a hurry
1. A class of students take part in tree planting work, some of them carry water, and the other carry water. It is known that the whole class shares 59 buckets and 36 carrying poles. How many students carry water and carry water? If there are x people carrying water and y people carrying water, the equations are as follows: (god horse If you can't understand the title, you'd better give the reason (3Q)
2. There are two rectangles, the ratio of length to width of the first rectangle is 5:4, the ratio of length to width of the second rectangle is 3:2, the perimeter of the first rectangle is 112cm more than the perimeter of the second rectangle, and the width of the first rectangle is 6cm more than twice the length of the second rectangle
(to solve the equation, we need to write the reason.)
3. In a game, Kobe made 28 of 46 shots, with a free throw percentage of 90% and a total score of 81. The score obtained by free throw and three-point shot is only 3 points less than that of other shots. Scoring rules: one point is added for each three-point shot, and two points are added for each other shot. If the opponent fouls, one point is added for each missed free throw, and the free throw is calculated separately, How many three-point shots, how many two-point shots, how many free throws did Kobe hit? (God, excuse me, I'm a girl. I never watch basketball games. I'm in a coma. I have to write down the reasons and solve the equations.)
Can answer which is which. Answer out of a hurry to tell me ah

1. Carry is two people a bucket, a shoulder pole carrying water is a person a shoulder pole two buckets
x+2y=59
x+y=36
x=13 y=23
2. Let the first rectangle be 5A in length and 4A in width, and the second rectangle be 3B in length and 2b in width
18a-10b=112
4a=6b+6 a=9 b=5
S1 = 20A (square) = 1620cm2 S2 = 6B (square) = 150cm2
3. One point for three? NC?

1. In summer, in order to save electricity, we often take two measures to raise the set temperature of air conditioner and clean the equipment. A hotel first raised the set temperature of both air conditioners by 1 ℃. As a result, air conditioner a saves 27 degrees more electricity than air conditioner B every day. After cleaning the equipment of air conditioner B, the total power saving of air conditioner B is only 1.1 times of that of air conditioner B after raising the temperature by 1 ℃, However, the power saving of type a air conditioner is the same, so that the two air conditioners save 405 degrees of electricity every day. How much electricity do the two air conditioners save every day when the temperature is only raised by 1? ℃?
2. The distance between a and B is 50 kilometers. Party A and Party B walk from a and B at the same time. Two hours later, they meet on the way. Then Party A returns to place a, and Party B continues to move forward. When Party A returns to place a, Party B is 2 kilometers away from place a, so as to find the speed of Party A and Party B

Question 1: set a air conditioner to save x degrees of electricity every day and B air conditioner to save y degrees of electricity every day
It can be seen from the question that X-Y = 27; X + 1.1y = 405; X + 1.1y = 405; X + 1.1y = 405;
The result is x = 207, y = 180
The second problem: this problem needs to draw a picture, let a speed be x km / h; B speed be y km / h
The first equation is 2 * (x + y) = 50
The second equation is based on the walking schedule of B: the time for a to return to a is equal to the time for a to go, that is, the time for a and B to meet each other is 2 hours, so a takes 4 hours from departure to return to A. in these four hours, B is 2 kilometers away from B to a, so the formula is 4 * y = 50-2, and the solution is x = 13, y = 12

A -- X
/ 120 /
————/- / - / - (less than 15)
/3 times/

15 less-
3x-15=120

According to the following equation, a - {{120} {{- / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / - / -
A——
︷︷120︷︷
——/- / - / - / - (less than 15)
Three times

120-15=3X
X=35

Equation: 54x △ 9-36 = 2x-19, as soon as possible! There is a big reward! 1

The original formula can be changed into:
6X-36=2X-19
4x=36-19
x=17/4
If I understand correctly

Equation 7 (2x-1) - 3 (4x-1) = 11
A. 14x-7-12x+1=11B. 14x-1-12x-3=11C. 14x-7-12x+3=11D. 14x-1-12x+3=11

To get the denominator: (14x-7) - (12x-3) = 11, that is: 14x-7-12x + 3 = 11