2、 Calculate the following questions ① (- 5) / (- 6) / (- 6 / 5) ② - 48 △ 36 × (- 1 / 9) ③ - 7 △ (35 + 7 / 9) ④ 2 / 3 × 1.43-0.57 × (- 2 / 3) ⑤-15×12÷6×5

2、 Calculate the following questions ① (- 5) / (- 6) / (- 6 / 5) ② - 48 △ 36 × (- 1 / 9) ③ - 7 △ (35 + 7 / 9) ④ 2 / 3 × 1.43-0.57 × (- 2 / 3) ⑤-15×12÷6×5

1. The original formula = 5 / 6 * (- 5 / 6) = - 25 / 36
2. The original formula = - 4 / 3 * (- 1 / 9) = 4 / 27
3. The original formula = - 7 * 9 / 322 = - 9 / 46
4. The original formula = 2 / 3 (145 / 100 + 57 / 100) = 2 / 3 * 2 = 4 / 3
5. The original formula = - 15 * 12 * 1 / 6 * 5 = - 15 * 2 * 5 = - 150
I'm tired

Observe the following algebraic expressions: square root of a ^ 2; | a + 1 |; - A; 2 (cubic root sign a). Take an appropriate number and substitute it into the evaluation, then it must not be opposite to each other. The numbers are () and ()

They are opposite numbers, that is, one is positive and one is negative. Two positive numbers cannot be opposite to each other, so only a & # 178; and | a + 1 | are positive and cannot be 0 at the same time, because when they are 0 at the same time, there is no solution, that is, they cannot be opposite numbers to each other

calculation
(1) - 2 & # 178; △ 4 / 3 - [2 & # 178; - (1 / 2 × 1 / 3)] × 12
(2) (- 3) & # 179; × 1 and 1 / 4 × [- 5 + (- 2) & # 179; × 3 / 8] - 2008 power of (- 1) × - 2009 power of (- 1)
(3) - 1 / 2 x (- 4) & # - 178; + - 2 / 3 x 3 & # - 178;
2. Simplify the evaluation
5 (2x & # 178; y-3x) - 2 (4x-3x & # 178; y), where x = 1 / 2, y = - 1
3. Given a = x-x & # 178; + 1, B = x & # 178; - 1 + 3x, find the value of a-2b

Calculate the power of (1) - 2 & # 178; / / 4 / 3 - [2 & # 178; - (1-2 / 1 × 1 / 3)] × 12 = - 4 × 3 / 4 - (4-1 + 1 / 6) × 12 = - 3-36-2 = - 41; (2) (- 3) &# 179; × 1 and 1 / 4 × [- 5 + (- 2) &# 179; × 3 / 8] - (- 1) × 2008 × (- 1) × 2009 × (- 1) = - 27 × (5 / 4) ×

Solving an applied problem of quadratic equation of one variable
Xiaoming has five pieces of RMB, with a total face value of 20 yuan. He went to the fruit shop and bought x kg apples. X is an integer. According to the marked price, he should pay y yuan, which is exactly equal to the sum of the face value of two pieces of RMB. There are also 6kg apples in the fruit basket. The owner said that if Xiaoming bought the rest of the apples, he would pay 10 yuan with the new ones. After calculation, Xiaoming reduced 0.5 yuan per kilogram. Try to find X and y

The total face value of the five pieces of RMB is 20 yuan. There can only be one case, that is, 1 yuan, 2 yuan, 2 yuan, 5 yuan and 10 yuan each

The figure below is the plan of two rectangular swimming pools (scale is 1:1000). Please measure their length and width, and calculate the actual floor area of the two swimming pools according to the measured data. If there are 100 people in swimming pool a and 60 people in swimming pool B, which swimming pool are you going to swim in? Why?
I have measured it. A: 4cm in length and 2.5cm in width. B: 3cm in length and 2.5cm in width
The first question must have a formula, easy to understand formula; the second question is not too long, but not without!

1) A swimming pool length: 0.04 * 1000 = 40 m width: 0.025 * 1000 = 25 m actual floor area: 40 * 25 = 1000 m2 B swimming pool length: 0.03 * 1000 = 30 m width: 0.025 * 1000 = 25 m actual floor area: 30 * 25 = 750 M2 2) a swimming pool per capita area 1000 / 100 = 10 m2 / person B swimming pool

Xiaohua walks 3 kilometers at 3 / 4 hours. How many hours does it take to walk 1 kilometer?

3 km divided by 1 km = 3
3 / 4 times 1 / 3 = 1 / 4
A: it takes a quarter of an hour to walk a kilometer

Niu's poems, idioms, sayings and proverbs?
Everybody help!

Never boast, never be conceited. Looking at many things in ancient and modern times, success comes from modesty and failure comes from extravagance

There are six numbers in a row. The average of them is 65. The average of the first four numbers is 55. The average of the last three numbers is 80. The fourth number is 65______ ．

55 × 4 + 80 × 3-65 × 6, = 220 + 240-390, = 460-390, = 70, so the answer is: 70

Solve the equation 6x ^ 2 + 5x + 6 / 2 of x ^ 2 + 5 / 2 of x = 38

From 6x ^ 2 + 5x + (6 / x ^ 2) + (5 / x) = 38, and then add and subtract 12, we get: 6 [x ^ 2 + 2 + (1 / x ^ 2)] + 5 [x + (1 / x)] - 50 = 0, which is reduced to: 6 [x + (1 / x)] ^ 2 + 5 [x + (1 / x)] - 50 = 0. For the convenience of description, let y = x + (1 / x), there is: 6y ^ 2 + 5y-50 = 0, the solution is: y = 5 / 2 or y = - (10 / 3), that is: x + (1 / x) =

Journey to the West Chapter 59 outlaws of the marsh
1. Who does "skirt hairpin" refer to?
Why does she hate monkey?
3. Why does the monkey king want to "deliberately talk about the cause of marriage"?
4. In Shuihuzhuan, the heroes also use the time skillfully to win. What was the time like at that time?

Journey to the West Chapter 59 sun Xinger's one tune banana fan 1, the original sentence: the skirt hairpin was originally a strange cultivation, and it was used to sow hatred for her son. It's very basic common sense that the skirt hairpin refers to Princess Iron Fan 2. Red boy is the character of Princess Iron fan. The monkey king asked the Bodhisattva to accept it and make it a good money boy, which makes it difficult for mother and son to meet