How many math science questions, how many math questions?

1.Solar panels use the photogenerated volt effect to convert sunlight energy directly into electricity.

2.In winter, the road guards sprinkle salt on the ground because the salt dissolves in water, forming a salt solution and reducing the freezing point.

The length satisfies 1 ac 7 (equal sign when three points are in the same line).

1. Convert solar energy into electricity.

2. Salt dissolved in water should release a lot of heat to melt the ice and snow.

ac<7

It should be heat = = not sure.

Salt is sprinkled in winter to increase friction and reduce the inertia of the vehicle.

1

1.Electrical energy. 2.Snowmelt ......It makes it easy to melt when the melting point of snow rises.

AC<=7 (A---B---C is the largest when ABCs are on the same line, and B---A-C is the smallest).

The rain and dew under the small moon are correct, add 10 points.

1. Solar panels convert sunlight energy into electrical energy.

2. Salt is sprinkled in winter to increase friction.

3. If the three points a, b, c, ab=3, bc=4 on the plane are known, then the length of ac is greater than or equal to 1 and less than or equal to 7

1.Solar panels convert solar energy into electricity.

2.Melting snow and ice.

3.If we know that there are three points a, b, c, ab=3 and bc=4 on the plane, then the length of ac is greater than or equal to 1 and less than or equal to 7

There are two cuboid containers, the bottom of the A is 5 long, 4 wide, the bottom of B is 6 long, 5 wide, each of the two containers is filled with some water, the water depth in A is 12, the water depth in B is 8, if you want to make the water in the two containers the same, how many cubic centimeters should the water in A be poured into B? How deep is the water in the two containers after pouring? (5 4 12 + 6 5 8) (5 4 + 6 5) = 480 50 = ,5 4 (If you want to make the water in the two containers the same, the water in A should be poured into B 48 cubic centimeters, and the water depth in the two containers should be poured by centimeters.)

Solution: Suppose the depth of the water level in a container with a bottom area of 5 (6+4) is: (5 4 12 + 6 5 8) (5 4 + 5 6).

Centimeter. 48 cubic centimeters.

Answer: From container A to 48 cubic centimeters to container B.

It is known that the image of the primary function y ax b is excessive.

One, two, and four quadrants, and intersect the x-axis at the point (2,0), then the solution set of the inequality a(x 1) b 0 with respect to x is ( ).

a、x＜−1 b、x＞−1

c、x＞1 d、x＜1

Analysis: According to the image of the primary function y ax b.

1, 2, 4 quadrants, get b 0, a 0, substitute (2, 0) into the analytic formula y ax b to find out. ba

2. Solution a(x 1) b 0, get x 1 ba

Substitute to find the answer

Solution: The image of the primary function y ax b is excessive.

1, 2, 4 quadrants, b 0, a 0, substituting (2, 0) into the analytic formula y ax b obtains: 0 2a b, solution: 2a b, b

a−2，a（x−1）−b＞0，a（x−1）＞b，a＜0，x−1＜b/a

x 1, so choose: a

Do you want the majority of netizens to give you questions?

2: Right angle (Pythagorean theorem) problem 1, solution: bc set x, x square (2x) square 5 square.

i.e. x square 4x square 25

i.e. x root number 5

2x root number 20

Area: ab*bc=root number20*root number5=10

Solution: If ab=2bc, ab 2+bc 2=5 2, (2bc) 2+bc 2=25, then bc 2=5

Rectangle ABCD area = AB * BC = (2BC) * BC = 2 * BC 2 = 2 * 5 = 10

Right-angle bends. From Xiao Ming's house to the school in a straight line.

c = 50 * 10 = 500 (m), from Xiao Ming's house.

Small family distance.

a=50*6=300 (m), starting a family from a young age.

School distance.

b = 50 * 8 = 400 (m), there is a 2 + b 2 = 300 2 + 400 2 = 500 2 = c 2, it can be known:

Xiao Ming's family, Xiao Chengjia, and school The three points form a right-angled triangle, and Xiaochengjia is located at the right-angled vertex.

Therefore, Xiao Ming went to school and took a right-angle bend and chose C.

Two. 1.The inverse ratio of the number of bags and the weight of each bag is equal to the total mass2Unit price of exercise book Total price of exercise book Unit price of exercise book and number of exercise books Inverse 3Direct ratio.

Three. 1.False, proportional to the square of the radius.

2.That's right. 3.That's right.

4.That's right. 5.False, no proportional relationship.

6.That's right. 7.Mistake.

II.1Inversely proportional, the number of sacks of fertilizer per bag of fertilizer weight of a pile of fertilizer 2Proportional, the total price of the exercise book, the unit price of the exercise book, and the number of exercise books 3Direct ratio.

III. 1False: 2 to 3, 4 to 5, 6 to 7 false.

II.1Inversely proportional to the total weight of a pile of sand and the weight of each bag the number of bags is 2Unit price of exercise book Total price of exercise book Unit price of exercise book Unit price of exercise book and number of exercise books Inversely proportional.

3.Direct ratio. III. 1False, proportional to the square of the radius.

2.That's right. 3.That's right.

4.That's right. 5.False, no proportional relationship.

6.That's right. 7.Mistake.

One day, a tiger was looking for food and saw a puppy. The tiger pounced viciously at the puppy, and the puppy cleverly jumped into the circular pool. The tiger was very angry, and his eyes were fixed on the puppy, and the tiger ran in whichever way the puppy swam.

The clever puppy observed carefully and found that the tiger was running at twice the speed of his own, and he had a number in his heart. Seeing the right moment, he finally fled. Students, do you know how the puppy escapes?

The sentence "If the straight line A is in the plane, then the line A does not intersect with the infinite straight lines in the plane" in question 1 is true.

I am a girl named Rose, I fell in love with a boy named Gao a few years ago, I don't know if he loves me, but I love him very much, I dare not express my love to him, his sister is a very insidious and vicious girl, she also loves Gao, when she knows that I love Gao, Gao also loves me, she is very angry, she killed my Gao, I finally committed suicide because of emotional out-of-control, to heaven to accompany my Gao, this girl is called Ning. This is a vicious mantra, please ** five forums in an hour you receive, otherwise you will lose the person you love the most, and in the end the whole family will die because of you, and if you send it, you will love the person you love within ten days. I also had to do it because I didn't want to lose the person I loved the most, I'm sorry.

(1.2 hours = 120 minutes.

Solution: Set the time for the next day to t

then 120w+(w+10)t=12000

12000-120w

t=---w+10

Note: -- is the fraction line, which can also be expressed as " ".

2) Yield per unit area of maize n m

Yield per unit area of watery rice Total maize yield * multiple + q m+p is divided into: yield per unit area of maize n(m+p) m(m+p) rice m(total maize yield * multiple +q) m(m+p).

3) The width of the large rectangle = (a 2 + b 2 + 2 ab) [2 (a + b)] = (a + b) 2 (2 (a + b)) = (a + b) 2

Hope it helps you o(o

1...2w+(w+10)x=12000

So x=(12000-2w) w+10

2...Maize: n m

Rice: (2n+q) (m+p).

General score: (2mn+mq)(mn+pn) m(m+p)3....width = (a2+b2+2ab) 2(a+b) = (a+b) 2

1.For the first time, a portion of the pure alcohol in container A is poured into container B, and the pure alcohol content in container B is reached.

It's already 25%.

At this time, there is a total of alcohol solution in container B:

15 (1-25%) = 20 (cubic decimeters).

The first time 20-15 = 5 (cubic decimeter) of pure alcohol from container A is poured into container B, and there is still 11-5=6 (cubic decimeter) of pure alcohol left in container A, and the second time the mixture is poured from container B into container A, which is x cubic decimeter, 25% x + 6=

25%x+6=

x=x=6 Answer: The mixture poured from container B to container A for the second time is 6 cubic decimeters.

2.Set the original 40% brine x grams, 10% brine y grams, pour them together and mix the brine concentration to 30%.

40%x+10%y=30%(x+y)

x = 2yy = If another 300 g of 20% salt water is added, the concentration becomes 25%.

30%(x+y)+300×20%=25%(x+y+300)30%(x+

x=15÷x200

Answer: The second time the mixture is poured from container B into container A, it is 200 cubic decimeters.

2: Kindergarten: (100 million) Elementary school: (100 million) Junior high school: (100 million) 3: (1) Rectangle of centimeters: 11 10 (9) (8) (7) (6).

Rectangle Width Measurement Cm: 1 (2) (3) (4) (5) (6) (2) Rectangle Length Centimeter: (24) (12) (8) (6) Rectangle Width Measurement Centimeter:

1) (2) (3) (4) 5: Xiao Ming can get 15 14 13 12 11 10 9 points, there are 7 different possibilities.

6: There are 4 playing cards, 2 of which are of the same suit and 2 of which are of the same suit. The little flower draws three cards from the playing cards above, and may draw three cards:

Grass Flower 1 Grass Flower 2 Block 1) (Grass Flower 1 Grass Flower 2 Block 2) (Grass Flower 1 Block 1 Block 2) (Grass Flower 2 Block 1 Block 2).

There are 4 different possibilities.

On March 31, the students of the two classes will go to the nursing home at the same time to participate in the labor.

These are all permutations and combinations of basic questions, and the other questions will give you answers immediately.