2 application questions, 5 points for good ones!

A glass of milk: unit "1".

I drank 1 2 of it, then I filled it with water (I added 1 2 cups of water) and drank 1 3 of this glass of milk, and then I filled it with water (I added 1 3 cups of water) Water: 1 2 + 1 3 = 5 6, milk: 1

5 6 1, so there is more milk.

2. A movie will be screened for 120 minutes, and Xiao Ming will watch it for 50 minutes (there are 120-50=70 minutes left).

Dad: The remaining time is 1 2 minutes more than 12 of the full showtime.

80 (min).

Xiao Ming: The remaining time is 20 minutes less than the 3 4 of the full length of the showtime.

70 (min).

Xiao Ming: Yes.

1) No matter how much water is added, Xiao Li finally drank all the cups of milk, so the amount of milk he drank was 1 cup;

In addition, the water that was added twice is 1 2 + 1 3 = 5 6, so the water is 5 6 cups.

So Xiaoli drinks a lot of milk.

2) Now the movie has been watched for 50 minutes and there are 70 minutes left.

According to Dad, there should be left: 120 * 1 2 +12 = 72 (minutes); So what Dad said wasn't right.

According to Xiao Ming, there should be left: 120 *3 4 -20 =70 (minutes); So what Xiao Ming said is right.

1. Lots of milk. Because milk drinks one glass, water drinks 1 2 + 1 3 = 5 6 cups, 1>5 6, so there is more milk.

2, Xiao Ming is right! Because the remaining time is 120-50 = 70 minutes, and 120*1 2+12=72 minutes, 120*3 4-20=70 minutes, so Xiao Ming is right!

1. Xiaoli drinks a lot of milk.

Because: consider this glass of milk as a unit "1", and only add water twice, i.e. 1 2 and 1 3, and the sum of the water is 5 6, and 5 6 is less than 1. So drink more milk.

2, Xiao Ming is right!

4. Two cars A and B traveled in the same direction from two places 272 kilometers apart, and the two cars were 17 kilometers apart after 3 hours. A travels 45 kilometers per hour, how many kilometers does B travel per hour? B travels x kilometers per hour 3 (45 x) 17 = 272

1.1 cup of milk.

2.1/2 of water plus 1/6 plus 1/3 equals 1

The same. Xiao Ming: Yes.

You'll know it when you do the math.

1.Solution: Think of the solution in the whole cup as the unit "1" After drinking 1 2 first, it is equivalent to drinking 1 2 milk and filling it with water, which is equivalent to 1-1 2 = 1 2 milk in the cup, 1-1 2 = 1 2 water After drinking 1 3 again, it is equivalent to drinking 1 2 * 1 3 = 1 6 milk, 1 2 * 1 3 = 1 6 water Now, there is still 1 2-1 6 = 1 3 milk, 1 2-1 6 = 1 3 water Fill it with water, which is equivalent to adding 1-1 3 (milk) -1 3 (water) = 1 3 water Finally, drink it It is equivalent to drinking 1 3 milk again, 1 3 + 1 3 = 2 3 water So, a total of 1 2 + 1 6 + 1 3 = 1 milk drank a total of 1 6 + 2 3 = 5 6 water Because 1 is greater than 5 6, that is, more milk is drunk.

2.There are 70 minutes left, and Dad is talking about 120* Xiao Ming is saying 120*(3 4)-20=70 So Xiao Ming is right.

1. Xiaoli drinks a lot of water, because he only drinks 1 cup of milk, and the water he drinks: 1 2 + 2 3 = 7 6 cups.

2. Xiao Ming is right, because there are 70 minutes left after watching 50 minutes, 120*1 2+12=72 minutes, 120*3 4-20=70 minutes.

1.Milk: 1 2 + 1 2 1 3 + (1-1 2-1 2 1 3) = 1 (cup).

Water: 1 2 1 3 + (1-1 3) (1-1 2 1 3) = 39 54 (cup).

I'm not so sure about this (==).

minutes) 120 1 2 = 60 (minutes) 120 3 4 = 90 (minutes) Dad: 70-60 = 10 (minutes) ≠ 12 (minutes) Xiao Ming: 90-70 = 20 (minutes).

So Xiao Ming is right.

1 can be counted as drinking water The first time I added 1 2 cups of water The second time I added 1 3 cups of water I drank a total of 5 6 cups of water And he drank a total of 1 cup of milk, so he drank more milk.

2 Remaining: 120-50=70 (minutes).

Dad: 120*1 2+12=72 (minutes).

Xiao Ming: 120*3 4-20=70 (minutes).

70 70 72>70 So Xiao Ming is right.

1) This batch of coal was actually burned for 52 days.

2)4x3-4-4x3x1/4=5

There are 5 liters left. 3) There are x fronts in this batch of zero sheds.

x/2+3x/7+450=5x/4

x=1400

4) Master Wang Yanqing processes and prepares x parts per hour.

11x=6x+50x6

x=605) met the bus for x kilometers.

x-9x/10=9x2

x=180

1. The two items ** are the same, A first reduces the price by 20%, and then increases the price by 20%. B first raises the price by 20%, and then reduces the price by 20% to stabilize **, and the ** of the two items A and B is (

2. After the price of each tape recorder is reduced by 30, the price is 350 yuan, how much yuan did this tape recorder originally cost?

3 Repair a road, the first day repaired the total length of 20, the second day repaired 200m, the third day repaired the sum of the previous two days, how many meters is the total length of this road?

4 After cutting off 20 pieces of rope, and then connecting them to 6m, the result is 30 longer than the original rope. How many meters was this rope originally long?

Assign students to draw on the blackboard.

5 After a rope is cut off by 20, and then connected to 6m, the result is longer than the original rope, how many meters is this rope originally long?

(1) This is an engineering application problem. The characteristic of engineering application problems is that unit 1 is generally represented by "1".

Explain that A's work efficiency is one-fifth. Then B's work efficiency is one-half, and putting one-fifth + one-half is equal to the work efficiency of two people in one day. Take their productivity in one day by 2, and you equals two days of productivity.

Their 2-day work is a fraction of the size of the project.

2) Then put the unit one, which is the project. Subtract what they did in these two days. If you divide the rest by A's work efficiency, it will be a few days.

Am I clear enough? Thank you! Hope it helps!

Are you in the sixth grade?

（1） 1/5=1/5 1/6=1/6 （1/5+1/6）*2=22/30

2) 1-22 30=8 30 8 30 1 6=8 5 (days).

Copy it, count yourself lucky, our Olympiad class just talked about engineering problems yesterday.

If teams A and B work together for 2 days, (1 5 + 1 6) * 2 = 11 15 will be used to complete the project

Next, it will be done by A alone, and it will take (1-11 15) 1 5=4 3 days.

（1） 2/5+2/6=17/30

13 6 (Balance.)

Answer: 17 30 completed this work. After 2 days of joint work between teams A and B, the next thing to be done by A alone will take 13 to 6 days to complete.

1；The efficacy of A is 1 5 per day, and the efficacy of B is 1 6 per day

2；(1-11 30) 1 5=19 6 days.

1.About two-fifths of a kilometer of Zhongshan East Road needs to be renovated. The engineering team renovated one-third of the total length in the first week and one-thirds of a kilometer in the second week. How many kilometers are left to be transformed?

Find the first week: 5 2 * 1 3 = 5 6 km.

Remaining: 5 2-5 6-1 3 = 8 6 km.

2.Warehouse A has 700 tons of fertilizer, and two-fifths of it is sold, and the fertilizer sold is exactly half of that of warehouse B. If warehouse B sells 3/8, how many tons of fertilizer should be sold?

First find how much warehouse A sells: 700 * 2 5 = 280 tons.

The fertilizer sold is exactly half of the size of warehouse B, find warehouse B: 280 divided by (1 2) = 560 tons.

If warehouse B sells 3/8, how many tons of fertilizer should be sold? In fact, what is 3 8 in warehouse B?

560 times 3 8 = 210 tons.

2..Warehouse A sells 700x(2 5)=280, and warehouse B actually has 280 (1 2)=560

Warehouse B sells 560x(3 8)=210 (tons).

On the first day, read 1 6 of the whole book

The next day look at page 24.

The third day looked at 150% of the total of the previous two days, which is 3 times 2 times.

1 6 + 24) * 3 2 = 1 4 + 36 pages of the book.

There are 1 4 left

24 + 36 = 60 accounts for 1-1 6-1 4-1 4 = 1 3 of the whole book, so the whole book has a total of 60 (1 3) = 180 pages.

1 There are a total of x pages.

Then there is: I read 1 6*x pages on the first day.

The next day I read 24 pages.

On the third day, I watched (1 6*x+24)*150%.

There are 1 4 that I didn't see, that is, I watched 1-1 4=3 4. Looked at 3 4x pages.

1 6*x+24+(1 6*x+24)*150%=3 4xSolutionx=180 pages.

There are x pages in the book.

Equations can be listed according to the conditions:

x 6 + 24) (1 + 150%) x 4 = x solves: x = 180

So the book has 180 pages.

1) m).

2) 243 * (1-2 3) = 81 81 * (1-2 3) = 27 27 * (1-2 3) = 9 9 * (1-2 3) = 3 3 * (1-2 3) = 1 So I ate for a total of 6 days, and ate one on the last day.

1) :(1+1) 2*2*2*2*2*2*2=256 (root) One meter is long: 256 meters long.

2）：243×2/3=162×2/3=108×2/3=72×2/3=48×2/3=32……Anyway, it seems to end up with 1 and 2/3.

And, come on, you're 3/2.

m) 2I don't understand, I ate 3 2 (three-two) of these peaches on the first day, and I ate 1 2 more, and there is still one on the second day? Please advise!

(1) Yes. Because if the two cars are transported together, one trip can transport tons, and if you make five trips, you can transport 9 * 5 = 45 tons "43 tons".

2) The freight of each trip of the cart is RMB, and the freight of each trip of the trolley is RMB, so the freight of each cart is more diversified than that of the trolley.

3) Because the distance = speed * time, speed = 65km h, time = , so the distance that the team has traveled = 65*, and the total distance = 200km, so the team still has a distance to go, that is, there is still a distance from the finish line B.