Help solve a few elementary school Chinese math problems!

The aspect ratio of the TV screen is 4 to 3, that is, 16 to 12, the length of the TV is 16, the width is 12, and the movie screen is 16 to 9, when the picture is displayed on the TV, the width of the TV screen is 9, so the picture area is 16 * 9, and the TV screen area is 16 * 12, so the black belt area accounts for 1 - (16 * 9) (16 * 12) = 1 4

Let the length of the TV be 16, the width is 12, and the movie screen is 16 to 9, when the picture is displayed on the TV, the width of the TV screen is 9, so the picture area is 16 * 9, and the TV screen area is 16 * 12, so the black belt area accounts for 1 - (16 * 9) (16 * 12) = 1 4 1, Qin Shi Huang (Qin Dynasty) Sima Qian (Western Han Dynasty) Li Bai (Tang Dynasty) Lu You (Southern Song Dynasty) Lin Zexu (Qing Dynasty).

2. A Li Bai B Wentong C Cao Cao D Bao Qingtian (Bao Zheng) 3, a Breaking the Cauldron and Sinking the Boat B 3 Looking at the Thatched House C Impressed D Smelling the Chicken Dancing e Chiseling the Wall to Steal the Light 4, 1, Concentrate 2, Baking the Clouds and Supporting the Moon 3, A Thousand Shots.

Language: 1. Qin Shi Huang, Sima Qian, Li Bai, Lu You, Lin Zexu.

Reason: In dynastic order, Qin Shi Huang (Qin), Sima Qian (Western Han), Li Bai (Tang), Lu You (Southern Song Dynasty), Lin Zexu (Qing).

2. Iron pestle into a needle--Li Bai is confident--Wen Tong Wangmei quenches thirst--Cao Cao is selfless with an iron face--Bao Zheng.

3, Xiang Yu -- embattled Zhuge Liang -- three visits to the thatched house Lu Meng -- impressive Zu Zhen -- smelling the chicken dancing Kuang Heng -- chiseling the wall and stealing the light.

Concentrate on the moon and stars, and the stars are scarce, and 100,000 are urgent.

Language: 1 Qin Shi Huang, Sima Qian, Li Bai, Lu You, Lin Zexu Reason: According to the order of the historical dynasties in which the characters lived.

2 serial numbers, a Li Bai b Wen Yu Ke c Cao Cao D Bao Zheng.

3a Breaking the cauldron and sinking the boat b Clever calculation c Hands do not release the volume D Smell the chicken dancing e Chisel the wall to steal the light.

4 1 Concentrate and concentrate 2 Meteors and light moons, the wind is clear and the moon is clear 3 Imminent, a thousand shots.

Let's add some points!!

Qin Shi Huang, Qin Dynasty, Sima Qian, Western Han Dynasty, Li Bai, Tang Dynasty, Lu You, Southern Song Dynasty, Lin Zexu, Qing Dynasty.

Li Bai, Wentong, Cao Cao, Bao Zheng.

Break the cauldron and sink the boat, and look at the thatched house.

When you see your classmates listening attentively, you think of the idiom: concentrate, concentrate, and keep your eyes peeled.

When you see the moon and nebula in the night sky, the idiom comes to mind: the stars arch over the moon.

When the situation is very critical or urgent, the idiom comes to mind: a thousand moments.

Idiom Archive: 1. Concentrate on it.

2. The moon stars are scarce.

3. One shot.

18 people completed one-third of a project in 12 days, and the remaining two-thirds of the project took 30 days to complete, assuming that everyone's daily workload is the same and unchanged, then how many people do you need to complete the remaining project?

Solution: per person per day: 1 3 18 12 = 1 6482 3 30 1 648 = 14 and 2 5

So 15 people are needed.

I'm a teacher, thank you.

We call what one person accomplishes in one day a job, then 12 people complete 12 * 18 = 216 jobs in 18 days. This is 1 3, then the remaining 2 3 still have 432 jobs, which will be completed in 30 days, 432 30 = 14 and 12, because there are still 12 jobs left, and one person is needed. So to do it in 30 days, it takes 15 people.

1. Cut a square wooden block with a length of 10 cm into the largest cone, and the volume of this cone is ( ) cubic centimeters; The volume of the shaved part is ( ) cubic centimeters.

Cone base radius: 10 2 = 5 cm.

Cone height: 10 cm.

Volume: 1 3 cubic centimeters.

The volume of the shaved part: 10 10 cubic centimeters.

1. Cut the cube wood block with a length of 10 cm into the largest cone, and the volume of this cone is ( ) cubic centimeters; The volume of the shaved part is ( ) cubic centimeters.

For example, if it is a cone with a bottom diameter of 10, find the volume of the cube, find the volume of the cone, and make a difference, that is, the volume of the eliminated part. Cone volume = base area * height * 1 3 = square of radius * height * 1 3

Buying commission 8*5000*RMB; Selling commission 9*5000*yuan; Stamp duty is 9 * 5000 * yuan, Mr. Zhang can make money: 5000 - (120 + 135 + 45) = 4700 yuan.

Mr. Zhang's total cost is 5,000x8 = 40,000 yuan, and the stamp duty must be paid.

Commissions are paid in dollars.

Mr. Zhang's theoretical income should be 5000x9-40000=5000 yuan, which is 5000-40-120=4840 after deduction

The cost at the time of purchase is 5000*8*(1+RMB.)

The income when selling is 5000*9*(yuan.)

Therefore, he earned 44820-40160=4660 yuan.

Tax 5000 yuan.

Commission of 5000 RMB.

Profit 5000 (9 8) (85 255) 4660 (yuan), that is, Mr. Zhang can earn 4660 yuan.

180 (38-2) = 5 meters.

The ends don't count, so 36 out of 38 chairs are empty.

Ah, yes, for abundance, great right and great Afsa.