In the rational number m, N, P satisfy When the rational numbers m, N, P satisfy that the absolute value of M divided by m plus the absolute value of N divided by N plus the absolute value of P divided by P equals 1, find the value of 2mnp divided by 13mnp1 Calculate 1 and 1 / 2 minus 2 and 5 / 6 plus 3 and 1 / 12 minus 4 and 19 / 20 plus 5 and 1 / 30 minus 6 and 41 / 42 plus 7 and 1 / 56 minus 8 and 71 / 72 plus 9 and 1 / 90

In the rational number m, N, P satisfy When the rational numbers m, N, P satisfy that the absolute value of M divided by m plus the absolute value of N divided by N plus the absolute value of P divided by P equals 1, find the value of 2mnp divided by 13mnp1 Calculate 1 and 1 / 2 minus 2 and 5 / 6 plus 3 and 1 / 12 minus 4 and 19 / 20 plus 5 and 1 / 30 minus 6 and 41 / 42 plus 7 and 1 / 56 minus 8 and 71 / 72 plus 9 and 1 / 90

Question 1: 2 / 13
1-3 + 3-5 + 5-7 + 7-9 + 9 + 1 / 2 + 1 / 6 + 1 / 12 + 1 / 20 + 1 / 30 + 1 / 42 + 1 / 56 + 1 / 72 + 1 / 90
=1+1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
=2-1/10
=1 and 9 / 10

M square (A-1) + n square (1-A) how to write this math problem!
Square of M (A-1) + square of n (1-A)

M square (A-1) + n square (1-A) = m square (A-1) - n square (A-1) = (m square - n square) (A-1) = (M + n) (m-n) (A-1)

If the vector am is perpendicular to an, then k = ()
A. 6B. 7C. 8D. 9

∵ am = (- 1, 1), an = (5, K-2), am ⊥ an. ∵ am · an = - 5 + K-2 = 0, the solution is k = 7

Four math problems, if I do it right, I'll give you extra points,
1. A car pays 168 yuan for the first 35 liters and 192 yuan for the second 40 liters
(1) The ratio of the cost to the quantity of the first refueling is ()
(2) The ratio of the cost and quantity of the second refueling is ()
(3) Can these two ratios form a proportion? Why? If so, write the formula below
2. Write two ratios of 3 and make up the ratio
The proportion of (): () = 3 (): () = 3 is ()
3. Connect the ratio of equal ratio with a line
5/12：2/3 1.5：2.5
10：15 2/7：5/7
0.6：1.5 5：8
18：30 1：3/2
The proportion of energy composition is as follows:
4. The following is a record of Lingling's measurement of the mass and volume of several objects in the laboratory
The ratio of object number mass / gram volume / cubic centimeter mass to volume
(1) Complete the form above
(2) The proportion of energy composition is as follows:

I have to do three math problems today,
1. The road from a to B is 250 kilometers long. A and B leave from two places at the same time and meet each other in two hours. Given that the speed ratio of a and B is 3:2, how many kilometers do a and B travel each hour? (to calculate formula!)
2. The charging standard of parking lot is as follows: 6 yuan / vehicle for medium-sized vehicles and 4 yuan / vehicle for small-sized vehicles. There are 50 medium-sized and small-sized vehicles, with a total charge of 230 yuan, including () small-sized vehicles and () medium-sized vehicles

1. Let a row every hour VA = 3V km, B row every hour VB = 2V km
3vt+2vt=5vt=5×2×v=10v=250 ×2
Then v = 50, VA = 3V = 150, VB = 2V = 100
2. There are x small cars and Y medium cars
6x+4y=230
x+y=50
The solution is: x = 35, y = 15

1/2007+2/2007+3/2007.+2005/2007+2006/2007
result?

（1/2007+2006/2007）×2006÷2=1003

The denominator of a fraction is 72 times larger than the numerator, and it is about 5 / 13 after the fraction. What is the fraction?

If the numerator and denominator are multiplied by X, and the denominator is 72 larger than the numerator, then
13X-5X=72
8X=72
X=9
The original score is: 5 * 9 / 13 * 9 = 45 / 117

Shopping malls carry out discount activities, where the purchase of more than 200 yuan in cash 40 yuan. Xiaodong mother with 680 yuan to shopping malls, please help him calculate, he can buy up to how many yuan of goods?

Take out 600 yuan to buy things first, give 120 yuan in cash for three times, and then add 80 yuan in front, a total of 200 yuan, and you can give 40 yuan as a gift, so
600 + 120 + 80 + 40 = 840 yuan
The most he can buy is 840 yuan

Three math problems
1. What is the area of a 4-decimeter-long cube with red paint on its surface? Cut it into eight small cubes of the same size. What is the area of each small cube without red paint?
2. A cuboid shaped swimming pool, 50 meters long and 25 meters wide, with the original depth of 1.2 meters. How many hours will it take if the water pump is used to drain 2.5 cubic meters per minute?
3. A cube glass container is 2 decimeters long. Pour 5 liters of water into the container, and then put a stone into the water. At this time, the water depth in the container is 15 cm. What is the volume of the stone?
Thank you

1. What is the area of a 4-decimeter-long cube with red paint on its surface? Cut the block into eight small cubes of the same size. What is the area of each small cube without red paint? A: 4 * 4 * 6 = 96; 122. A rectangular swimming pool, 50 meters long and 25 meters wide

one
Two bags of rice weigh 1200 kg in total. Take 25% from bag a and pour it into bag B. the weight of two bags is equal. How many kg are each of bag a and bag B?
2. There are 50 people in class A and 60 people in class B. how many people are transferred from class B to class a? The number of people in class B is 50% of class a?
3 two barrels of oil a barrel is 20 kg less than B barrel. If you pour 3 kg from a barrel into B barrel, then the weight of a barrel is 37.5% of B barrel. How many kg does a barrel have?

After taking 25% from the bag, the original 75% & nbsp; of a is 600 kg, the original (1200 / 2) / (1-25%) = 600 / 75% = 800 kg, B has 1200-800 = 400 kg, class B is 50% of class A, so class B accounts for 1 / 3 of the total number of people & nbsp;, & nbsp; 60 - (50 + 60) * 1 / 3 = 70 / 3, B has 20 + XKG x-3 = (20 + X + 3) * 37.5% x = 18.6 & nbsp; kg