2* 15*(80+40)=3600 meters
2. For Xiaohong's birthday, she gave half of the cake to her grandmother, the rest to her mother, and the last half of the cake to herself. How many cakes did Xiaohong, Grandma and Mom each eat? Is this cake just finished? Why?
Grandma 1/2, Mom 1/4, Xiaohong 1/8.
1/2+1/4+1/8 = 7/8 is not equal to1,and the calculation is not finished.
3. A rectangle, 2/7 meters wide and 3/7 meters longer than the width. How long is it? What is the circumference of a rectangle?
Length 3/7+2/7=5/7
Perimeter 2*(2/7+5/7)=2
The red rope is 2m long and the yellow rope is 9/10m long. What color rope is the length? If yes, how many meters?
Yellow rope length
Length 10*9/ 10-2=7 decimeters.
1, processing a batch of parts, if you process 36 parts every day, you can finish the work with a day off every two days. 14 days, how many parts are there in this batch?
36*2*4+36*2=360
Xiaogang has to get up for 40 minutes every day to clean the house, including dressing, making the bed, going to the toilet, washing his face and combing his hair, and having breakfast. Making the bed, going to the toilet, washing your face and combing your hair account for 1/2, and dressing and eating account for half of the rest time. Can you reasonably allocate Xiao Gang's time as required? How many minutes did you spend dressing and eating?
It took 10 minutes to get dressed and eat.
40* 1/2* 1/2= 10
3. What is the circumference of a square with a side length of 2/7 meters?
4*2/7=8/7
Two ropes of the same length, rope A is1/2m, and rope B is1/2m. Who uses it a lot?
When the rope is greater than 1 m, B is more.
When it is equal to 1 m, it is the same.
More than or equal to 1/2m, less than 1m, there are too many nails.
1. Divide a rope into 10 segments. Xiaohua took 3 pieces and Xiaohong took 5 pieces. How many pieces are left? How much did Xiaohong and Xiaohua get each?
There is still1-3/10-10 =1/5.
Xiaohong 5/ 10= 1/2
Xiaohua 3/ 10
Dongdong and Mingming both bought the same pencil. A few days later, I obviously used the pencil's 1/2, and Dongdong used the pencil's 1/3. Whose pencil is longer now? Why?
The length of Dongdong
Dongdongzuo 1- 1/3=2/3.
Obviously, the remaining 1- 1/2= 1/2.
2/3- 1/2= 1/6 is greater than 0.
3. The price of two pairs of sneakers is equal to 12 pairs of cloth shoes. It costs RMB 54 yuan to buy 1 pair of sneakers and 3 pairs of cloth shoes. How much are sports shoes and cloth shoes?
Cloth shoes 54/(3+6)=6
Travel shoes 54-6*3=36 or 6*6=36
1. The school holds a football match, and every two teams only play one game. If there are four teams, how many games will * * * arrange? What about eight teams?
3+2+ 1=6
7+6+5+4+3+2+ 1=28
2. The fruit shop has apples and pears * * * 120kg. As we all know, the weight of apples is three times that of pears.
How many kilograms are apples and pears?
Apple 120*3/4=90
Pear 120-90=30
2) How many kilograms are apples more than pears?
90-30=60
3. A bottle of oil bottle * * * weighs 7/8kg. Half used, there is still 4/8kg in the bottle. How many kilograms of oil are there? How much does this bottle weigh?
Bottle weight 2*4/8-7/8= 1/8.
Oil weight 7/8- 1/8=6/8=3/4.
1, boys in science and technology group are four times less than girls, 18, and 24 times more than girls. How many people are there in the science and technology team?
Set x girl
4x- 18=3x+24
x=42
A ***42+3*42+24= 192
2.60 people took part in the performance. If there are four lines, how many people will stand on each line? If you stand in five rows, how many people will stand in each row? If you want to stand in a square, how many people do you need to remove? Or at least how many people should be added?
60/4= 15
60/5= 12
Remove 60-7*7= 1 1.
Add 8*8-60=4.
3. An apple weighs 9/ 10 kg, which is lighter than pear/10 kg and heavier than banana 2/ 10 kg.
How much do three fruits weigh?
9/ 10+9/ 10+ 1/9/ 10-2/ 10 = 2.6kg。