Kneel and beg for good progress in mathematics.

1。Solution: If the width is x meters, the length is 2 x meters.

2（x+2x）=

6x=x=square meters).

A: The length is meters, the width is meters, and the area is square meters.

2。Let Xiaohong's walking speed be xkm m, which is known from the title.

7(45+x)=560

Solution. x=35

Set the length x and the width y

x=2y2*(x+y)=

Solution. x=y=2, let Xiaohong walk xm per minute

7*（45+x）=560

Solution. x=35

1) Solution: Set: Draw a width of x meters. The length of the painting is y meters.

2*x + 2*(2*x)=

solution x=m).

So the width is meters, the length is meters, and the area is square meters.

Hope it works for you.

2) Set Xiaohong to walk x meters per minute.

7 *（45+x）= 560

Solution x=35

Hee-hee......

1.From the title, let the width be a, then the length is 2a, so 2(a+2a)=-->6a= so the length is 2a=, and the width is, so the area is s=a*2a=2 2According to the title, Xiao Ming and Xiao Hong broke up at the school gate, and their home went in the opposite direction.

Xiao Ming arrived home in 7 minutes, indicating that his home is 45 7=315m

Xiao Ming is 560m away from Xiaohong's house, which means that Xiaohong's home is 560-315=245 from the school gate, and Xiaohong also arrives home in 7 minutes, so Xiaohong's speed is: 245 7=35 (meters).

1. If the length of the painting is a and the width is b, then there are:

a=2ba+b）*2=

The solution: a= b= square meters of area.

2. Xiao Ming's school gate: 7*45=315m

Xiaohong's house leaves the school gate: 560-315=245m

Xiaohong walks per minute: 245 7 = 35m

It is recommended to use your brain, read more questions and then think about how to do it, this question is not difficult.

Since there are so many well-wishers helping you, I don't care.

Let x, then:5-7x=, the solution is x=

6x-x=, the solution is x=

3. x+ is the pat of the literary book**), the solution is x=85, that is, the story book and the literary book are yuan respectively.

4. (Team B paves x meters every day) Min digging, and the bridge is solved by x = 36, that is, teams A and B are laying asphalt rice every day.

x+12*(8-x)=112 (x is the number of sunny days), and the solution is x=2

1）d。Should = 1

2) The opening is upward, the axis of symmetry x=a-1, and the function is subtracted from the letter number (4) on (negative and non-open, 4), then a-1>=4, so a>=5.

3）f(4)=4f(3)=12f(2)=24f(1)=24f(0)=24。

4) f(3) = root number (4) = 2.

3x+2=4x-12

x-14=0

The number of the quadratic term is 0, the coefficient of the primary term is 1, and the constant term is 14

Accustomed to thinking deeply, liking to explore different approaches to a problem and then reaching a satisfying sense of accomplishment. knows how to persevere, and can always spend a lot of time going to Tuan Moye to study the problem of You Sun.

Multiply 2:3 on both sides.

The ratio is 10 3:5:7

Always 46 3

10 3 divided by 46 3 times 368 = a spotted =

80 Second Shift: 120

Three shifts: 112

The ratio of classes 1 to 2 was expanded from 2 to 3 to 10 to 15, and the ratio of classes 2 to 3 was expanded from 5 to 7 to 15 to 21. The ratio of the first, second and third classes is:

10 to 15 to 21, a total of 46 parts, the first class accounted for 10 46, the second class accounted for 15 46, and the third class accounted for 21 46, respectively, multiplied by 368 trees:

Class 1: (10 46) 368 = 80 (trees).

Second class: (15 46) 368 = 120 (trees) Third class: (21 46) 368 = 168 (trees) Answer: 80 trees are planted in the first shift, 120 trees are planted in the second shift, and 168 trees are planted in the third shift.

Solution: Because the first class is 2:3 than the second class; i.e. 10:15;

Class 2 is 5:7 than Class 3; That is, 15:21;

The trees assigned to the first shift are: 368 (10 46) = 80 (trees) The trees assigned to the second shift are: 368 (15 46) = 120 (trees) The trees assigned to the third shift are: 368 (21 46) = 168 (trees).

This is easy to do, the first class is 3:2 than the second class, and the second class is 5:7 compared to the third class, so the first class is 10:

21, so 2 classes are 15:21 than 3 classes, and then solution, 3 classes are always 46:21, so divide 368 by 46 = 8, and then 1 is generally 10 parts so it is 80, the second class is 15 parts is 120, and the third class is 21 parts so it is 168

1`b2`56

3`4`a+4

a+25`46`

0 7 8 880 divided by 8 is equal to 110 [the speed of A and B] 110 divided by 10 [the speed of A and B].

A speed: 10 times 5 equals 50

B speed: 10 times 6 equals 60

9 Because the boys have not changed, 36 times equals 20 [number of boys], and 20 divided by 38 [number of boys].

38-36 is equal to 2 [the number of girls who come to read the book].

There are 368 trees divided into three classes, with a ratio of 2:3 to 2:3 and 5:7 to 5:7Ask for each one.

List: One shift.

Second class three class 2:

33,5 The least common multiple times 5 equals:

72 times 5 equals 10 and 7 times 3 equals :

Find the ratio and distribute it proportionally.

368 * (10 46) = 80 (trees) per shift.

368 * (15 46) = 120 (trees) for the second shift.

368 * (21 46) = 168 (trees) three shifts.

Untie; : Set up a shift of x pieces.

There are questions to obtain, the second shift is divided into 3 2x capsules, and the third shift is divided into 3 2x*7 5=21 10x capsules, so x+3 2x+21 10x=368

x=80

3/2x=120

21/5x=168

A: There are 80 trees in the first class, 120 trees in the second class, and 168 trees in the third class.

4 2 = 2 cm.

v Cylinder: cubic centimeters.

V-cone: 1 3 cubic centimeters.

Cubic centimetre. Except for the inexhaustible, write with a fraction).

Because ahha is a group, the hundredth letter is A

The letter A appears 1005 times in the first 2010 letters.

Take 4 letters in the pattern from left to right to form an axisial symmetry.

r-squared t=r-square. Simplify r r=(with t) t

The volume of a solid sphere with radius r v r=4 3*pi*r 3, the water surface is exactly raised t, i.e., the rising volume is v t=pi*r 2*t, because the volume of the ball is the volume of rising water v r=v t, i.e., 4 3*pi*r 3=pi*r 2*t

So r 2 r 3 = 2 (3t).

t is the volume of the ball, r is the radius of the ball, can't it be calculated by itself?

Because it takes 32 days for one person to complete, one person does 1 32 per day, and let x people do it first x 32 *2 + 1+x) 32 *4 = 1 2

The solution is x=2

Set up x people to work first, 2x+4(x+1)=16 x=2, arrange 2 people to work first.

Let A have 3x kg and B have 2x kg.

3x-10=2x+10x=20

Because the function passes the origin, substituting (0,0) gives the derivative of b = 0 f(x) = 3x square + 2 (1-a) x - (a square + 2a) When x = 0, the derivative = - (a + 2a) = -3

So a = 1 or -3

b=0;a=1/a=-3.

First, substituting (0,0) into the analytic formula yields b=0;After that, the derivative is obtained analytically, and f is obtained'(x)=x 3+(1-a)x 2-a(a+2)x, substituting (0,-3) to get a