Prawns Help 10 bounty

It is to have a dream, let's record the dream, the ancients used classical Chinese, the modern people use the vernacular, and the foreign can be written in English.

Let A's annual income x, B's annual income be 2 3x, and A's annual expenditure is y, then B's annual expenditure is 4 7y, then x-y=400, 2 3x-4 7y=400x=1800, y=1400, and in the end, A's annual income is 1800 yuan and the annual expenditure is 1400 yuan, and B's annual income is 1200 yuan and the annual expenditure is 800 yuan.

A's income: 1800 B's income: 1200 A's expenditure: 1400 B's expenditure: 800

Income: 1,800 yuan for A, 1,200 yuan for B, 1,400 yuan for A, 800 yuan for B.

— —Hetu Luoshu, add and calculate slowly.

Choose C. Because no matter what the bottom left corner is, p plus 1 is definitely equal to 2 plus 5

45 years old Now 30 years old.

Your adoption is my driving force.

Fifteen years ago at the age of fifteen, fifteen years later at the age of forty-five.

Hello! Solution:

Original = 11a + 1 + 2....9+10=11a+(1+10)+(2+9)+.5+6)=11a+11×5=11a+55

Your adoption is the driving force for my service.

Good luck with your studies!

Is there a positive or negative magnitude for these numbers?

National Champion No. 09 Chen Chusheng Guangdong Puning (No. 2 in Xi'an Singing District) No. 2 in the National 01 Awakening Shaanxi Xi'an (Xi'an Singing District Champion) No. 3 in the National No. 10 Wei Chen Gansu Lanzhou (No. 2 in Chengdu Singing District) No. 4 in the National 06 Zhang Jie Sichuan Chengdu (Chengdu Singing District Champion) No. 5 in the National 13 Ji Jie Sichuan Liangshan (Nanjing Singing District Champion) No. 6 in the National 04 Yu Haoming Guangdong Guangzhou (Guangzhou Singing District No. 2) No. 7 in the National 02 Wang Lixin Hunan Changde ( Guangzhou Singing District Champion) National 8th Place 08 Amuron Inner Mongolia Xilin Gol League (Changsha Singing District 3rd Place) National 9th National 12th Zhang Yuan Anhui Chuzhou (Nanjing Singing District 2nd Place) National 10th National 11th Wang Zhengliang Sichuan Chengdu (Chengdu Singing District 3rd Place).

In the second year of physics, pay attention to the meaning of the horizontal and vertical coordinates, d is wrong, density is the property of the object, and the calculation can be calculated in the same way, but it has nothing to do with the volume and mass of the substance.

d error. Because the density of a substance is related to its own properties, mass and volume are only borrowed to measure density, and do not determine density.