Several offline calculations! (Can be simplified) 4/5×1/3+2/5÷ 0.6-115

=4/ 15- 1/ 15+2/5×5/3

= 1/5+2/3

= 13/ 15

99×( 1/3+ 1/ 1 1+ 1/9)

=99× 1/3+99× 1/ 1 1+99× 1/9

=33+9+ 1 1

=53

[1-(4 and 1/3- 1 and 3/4×2)]2 and 1/2.

=[ 1-4- 1/3-2-3/2]×2/5

=-6×2/5-5/6×2/5

=- 12/5- 1/3

=-2 and1115

(1 and 5/8+ 1/4)÷(3/4×2 and 2/3- 1 and 1/2)

=( 13/8+ 1/4)×2

= 13/8×2+ 1/4×2

= 13/4+ 1/2

=3 3/4

Who can help me solve some comprehensive formula problems? The quadratic of 1 (-2)+9546-(-154)+1354+0.1*10 to the seventh power =

2.(- 0. 15 quadratic) +46/23* 1.5+546=

Please help me solve some scientific calculation problems. A factory installed a photoelectric control alarm bell at the gate of the factory for the safety of vehicles entering and leaving. The alarm bell will give a signal when the car leaves the factory gate from the front to the rear. A large truck drove out of the factory door at a speed of 5 km/h, and the alarm sounded for 6 seconds. How long is this car?

Help me out with a few second-year off-topic questions 30+5x6.

20+(5 1+28)

29+6x7

Who can help me solve the simple calculation problem of 10 0.4× 125×25×0.8?

=(0.4×25)×( 125×0.8)

= 10× 100= 1000

1.25×(8+ 10)

= 1.25×8+ 1.25× 10

= 10+ 12.5=22.5

9 123-( 123+8.8)

=9 123- 123-8.8

=9000-8.8

=899 1.2

1.24×8.3+8.3× 1.76

=8.3×( 1.24+ 1.76)

=8.3×3=24.9

9999× 100 1

=9999×( 1000+ 1)

=9999× 1000+9999× 1

= 10008999

14.8×6.3-6.3×6.5+8.3×3.7

=( 14.8-6.5)×6.3+8.3×3.7

=8.3×6.3+8.3×3.7

8.3×(6.3+3.7)

=8.3× 10

=83

1.24+0.78+8.76

=( 1.24+8.76)+0.78

= 10+0.78

= 10.78

933- 157-43

=933-( 157+43)

=933-200

=733

482 1-998

=482 1- 1000+2

=3823

I32× 125×25

=4×8× 125×25

=(4×25)×(8× 125)

= 100× 1000

= 100000

9048÷268

=(2600+2600+2600+ 1248)÷26

=2600÷26+2600÷26+2600÷26+ 1248÷269

= 100+ 100+ 100+48

=348

288 1÷ 43

=( 1290+ 159 1)÷ 434

= 1290÷43+ 159 1÷43

=30+37

=67

Help me solve some math problems in the second grade of junior high school. The fractional equation about x is 1/(x-2)+k/(x+2)=4/(x? -4) If x=-2, find k 。

Solution: Remove the denominator and get x+2+k(x-2)=4.

X+k(x-2)=2。

Substitute x=-2 into the original equation and get -2+k(-2-2)=2.

The solution is k=- 1.

X/y=2, find the value of 2x+y/x-y. 。

Solution: x/y=2, x=2y

2x+y/x-y

=5y/y=5 1, when 1/x- 1/y=5, find the value of the fraction (3x+5xy-3y)÷(x-3xy-y).

Answer: 5/4

2. given a+b+c=0, find a (1/b+1/c)+b (1/c+1/a)+c (1/a+/kloc).

Answer: -3

3. Solve the equation: (x-8)/(x-3)-(x-9)/(x-4) = (x+7)/(x+8)-(x+2)/(x+3).

Answer: x =-2/3

4. When a is what value, the equation x/(x-3)=2+a/(x-3) about X will generate root growth?

Answer: When a = 3, this fractional equation will produce root growth.

The buyer of Hualian Department Store found a shirt in Suzhou, which is expected to sell well, so he bought all the shirts with 80 thousand yuan, which is twice as badly needed. It was introduced that he bought a shirt in Shanghai for 176000 yuan, but the unit price was more expensive than that in Suzhou, 4 yuan. Everything in the commercial building is sold in 58 yuan, and the market is very good. The last remaining 150 pieces were sold out at a 20% discount. How much is the profit of commercial buildings?

A: The profit of this business is 90,260 yuan.

Xiaoming's family is going to decorate their new house. If Party A and Party B are two decoration companies, the cooperation will be completed in 6 weeks, and the salary will be 52,000 yuan. If Company A does it alone for 4 weeks, and the rest is done by Company B, it will take 9 weeks to complete, and it will cost 48,000 yuan. If only one company is selected to do it alone, from the perspective of saving money, does Xiaoming choose company A or company B? Please explain your reasons.

Answer: From the perspective of saving money, Company B should be chosen to complete it alone.

7. For the score (x-5)/(2x- 1), it is meaningful when x _ _ _ _ _ _ _, and meaningless when x _ _ _ _ _ _ _.

Answer: not equal to1/2; 1/2

8. If the equation (x-3)/(x-1) = m/(x-1) has an incremental root, then the incremental root is _ _ _ _ _ _, and the value of m is _ _ _ _ _ _.

Answer:1; -2

Help me to work out a few Olympic math problems, and it is best to work out the 2005 National Mathematical Olympiad Final of 1.

3. There is an integer, 70, 1 10 and 160 divided by which the sum of the three remainders is 50, so what is this integer?

4. Let M and N be natural numbers, remember that PM is the sum of all digits of natural number M and PN is the sum of all digits of natural number N. Also remember that M*N is the remainder of m divided by n, given that M+N=4084, what is the value of (PM+PN)*9?

5. As shown in the figure, it is known that CD=5, DE=7, EF= 15 and FG=6. The straight line AB divides the figure into two parts, the area of the left part is 38, and the area of the right part is 65. What is the area of triangle ADG?

6. A natural number can be expressed as the sum of 9 consecutive natural numbers, 10 consecutive natural numbers and 1 1 consecutive natural numbers. What is the minimum natural number that satisfies the above conditions?

7. It is known that the pure alcohol content of alcohol A is 72%, the pure alcohol content of alcohol B is 58%, and the pure alcohol content after mixing the two alcohols is 62%. If the amount of each alcohol is more than the original 15 liter, and the pure alcohol content after mixing is 63.25%, how many liters of methanol will be taken for the first time?

8. In the following formula, different Chinese characters represent different numbers, and the same Chinese characters represent the same numbers. So what are the three digits represented by "Happy New Year"?

9. There are two shopping centers. When the profit of the first mall decreases by 15% and the profit of the second mall increases by 18%, the profits of the two malls are the same. Then, how many times is the profit of the first shopping mall more than that of the second shopping mall?

10, take three from nine numbers 1~9, and these three numbers can form six different three digits. If the sum of six three digits is 3330, what is the largest of these six three digits?

1 1. There are five teams A, B, C, D and E participating in the football round robin, and every two teams will have a game. When the game is about to end, the statistics are as follows:

Team name wins, draws, negative numbers, goals scored and goals conceded.

A piece of 2 1 0 4 1

B 1 2 0 4 2

C 1 1 1 2 3

D 1 0 3 5 5

E 0 2 1 1 5

It is known that A and E and B and C are tied, and the scores are all 1: 1. What's the score between b and d?

12, a bus and a van set off from A and B at the same time and walked in opposite directions. The bus speed is 32 kilometers per hour, and the van speed is 40 kilometers per hour. When the two cars reached the second place and the first place respectively, they immediately returned to the starting point. When returning, the bus speed increased by 8 kilometers per hour and the van speed decreased by 5 kilometers per hour. Given that the two encounters are 70 kilometers apart, how many hours before the bus, does the van return to the starting point?

Help me do five simple off-line calculations. 3*4+7*4

89-56+ 1

46* 10* 100