Guess idioms, look at pictures, guess one idiom for each picture

Guess idioms, look at pictures, guess one idiom for each picture

1. The same as the same; 2. Self justification; 3. Commendable; 4
Six are straightforward, seven are incomparable, eight are neither laughing nor crying, nine are in harmony with others, and ten are three aunts and six grandmothers
11 five tone incomplete, 12 two side three knife, 13 a mess, 14 superfluous, 15 left and right bow
16 Arabian Nights, 17 sheep into the tiger's mouth, 18 in black and white, 19 bowing to the throne, 20 rock breaking
21 can bend and stretch, 22 three obedience and four virtues, 23 romantic and snowy, 24 all empty, 25 high prestige
26, 27, 28, 29, 30
31 to the point, 32 to draw inferences, 33 to the point, 34 to the point, 35 to the point

How to do the third question on the third page of mathematics winter vacation assignment of grade 6 Volume 1 (Beijing Normal University Edition)

10 yuan / sheet 5 yuan / sheet total
38 5 405
37 7 405
36 9 405
36*9=4
A: there are 36 for 10 yuan and 9 for 5 yuan

The length of a rectangular classroom measured on a 1:500 scale plan is 3cm and the width is 2cm. Write the ratio of the distance on the plan to the actual distance area
What did you find?

Length = 3cm * 500 = 1500cm = 15m
Width = 2 cm * 500 = 1000 cm = 10 m
Area = 3cm * 2cm = 6cm
Actual area = 1500 cm * 1000 cm = 1500000 square cm
Ratio of actual distance area = graph area / actual area = 6 / 1500000 = 1:250000
Actual distance area ratio = (distance ratio on the graph) ^ 2

A brief introduction to the story of mathematicians
Introduce some stories about mathematical scientists, simple? Understand? Main content... I will add five words, less is simple, just say the main content, brothers and sisters help me```

When Thales (ancient Greek mathematician and astronomer) came to Egypt, people wanted to test his ability, so they asked him if he could measure the height of the pyramid. Thales said yes, but there was one condition - the presence of the Pharaon. The next day, the Pharaon arrived as promised, and many onlookers gathered around the pyramid, The sun cast his shadow on the ground. After a while, he asked people to measure the length of his shadow. When the measured value was exactly consistent with his height, he immediately made a mark on the projection of the great pyramid on the ground, and then measured the distance from the bottom of the pyramid to the top of the projection. In this way, he reported the exact height of the pyramid, He explained to you how to deduce the principle from "shadow length equals body length" to "tower shadow equals tower height", which is the similar triangle theorem today

As shown in the figure, a quadrilateral grassland ABCD, where angle B = angle d = 90 degree AB = 15 BC = 20 CD = 7, find the area of this grassland

Connect AC
If angle B = 90 degrees, AC = √ (AB ^ 2 + BC ^ 2) = 25;
If angle d = 90 degrees, ad = √ (AC ^ 2-CD ^ 2) = 24
Therefore, the grassland area = s ⊿ ABC + s ⊿ ADC = AB * BC / 2 + ad * CD / 2 = 150 + 84 = 234

What are the moving objects in life
Don't be too general, just give me a few examples

Motion is relative, please understand this first. So, when we describe whether an object is moving or not, we must have a reference. As long as there is a reference, there will be countless moving objects. For example, if you take yourself as a reference, then the people around you are moving, moving cars, planes in the sky, the sea

Do zero vectors have directions
If the module of vector a is equal to the module of vector B, then the length of vector a is equal to that of vector B, and the direction is opposite or the same. Is that right?

A vector with mod (module) equal to zero is called a zero vector, which is recorded as 0. Note that the direction of the zero vector is arbitrary. But we stipulate that the direction of the zero vector is parallel and perpendicular to any vector
Wrong, the vector has both size and direction. If the module is equal, it only means that the size is equal and the direction is not equal. The direction of the vector is 360 ° arbitrary, so wrong

Equilateral triangle ABC, be = CF = a, EC = AF = B, BF bisect AE, find the relationship between a and B
Points E and F are points on equilateral triangle BC and AC respectively, where be = CF = a, EC = AF = B. find the relationship between a and B when BF bisects AE

Let the midpoint of AE be p through e to make AC parallel line, intersect BF at t, then because of ET / / AF, the angle pet = PAF, and the vertex angle is equal, AP = PE, then triangular AFP is equal to triangular ETP, then et = AF = B, and because of ET / / FC, triangular tbe is similar to triangular FBC, then ET / FC = be / BC, then B / a = A / (a + b), that is, a / b = B / A + 1, let a / b

In △ ABC, a, B and C are the opposite sides of ∠ a, B and C respectively. If a, B and C form an arithmetic sequence, ∠ B = 30 ° and the area of △ ABC is 32, then B is equal to ()
A. 1+32B. 1+3C. 2+32D. 2+3

∵ a, B, C are equal difference sequence, ∵ 2B = a + C, A2 + C2 = 4b2-2ac, and ∵ ABC's area is 32, ∠ B = 30 °, so from s △ ABC = 12acsin B = 12acsin 30 ° = 14ac = 32, AC = 6. ∵ A2 + C2 = 4b2-12. From cosine theorem, CoSb = A2 + C2 − b22ac = 4B2 − 12 − B22 × 6 = B2 − 44 = 32, and B2 = 4 + 23

As shown in the figure, it is known that ab ∥ De, ∠ 1 + ∠ 3 = 180 ° and verified by BC ∥ EF

It is proved that: ∵ ab ∥ De, ∵ 1 = ∵ 2, ∵ 1 + ∵ 3 = 180 degree, ∵ 2 + ∥ 3 = 180 degree, ∵ BC ∥ EF