Report to the top student, ask for support, and use the same assumptions as the first question

1. Method 1: Suppose that 100 stamps are all 4 corners, a total of (40) yuan, less than 48 yuan (8) yuan, to add 4 corners to the (20) sheets, there are (20) 8 corners, (80) 4 corners.

Method 2: Suppose that 100 stamps are all 8 jiao, a total of (80) yuan, more than 48 yuan (32) yuan, to reduce 4 jiao on the (80) piece, there are (80) 4 jiao, (20) 8 jiao.

2. Method 1: Suppose that all 30 people donate 5 yuan, a total of (150) yuan, which is less than 205 yuan (55) yuan, and (11) of them should increase 5 yuan, and (11) people donate 10 yuan and (19) people donate 5 yuan.

Method 2: Suppose that 30 people donate 10 yuan, a total of (300) yuan, which is more than 205 yuan (95) yuan, and to reduce (19) people by 5 yuan, there are (19) people who donate 5 yuan and (11) people who donate 10 yuan.

3. Method 1: 2 fountain pens are equal to 8 ballpoint pens, one fountain pen is equal to 4 ballpoint pens, and 3 fountain pens are equal to 12 ballpoint pens. A total of 12 + 7 = 19 ballpoint pens, the unit price of ballpoint pens is: 19 19 = 1 (yuan per piece).

The unit price of fountain pens is: (19-1 7) 3=4 (yuan per pen).

Method 2: 2 fountain pens are equal to 8 ballpoint pens, a ballpoint pen is equal to 1 4 pens, 7 ballpoint pens are equal to 7 4 pens, total: 3 + 7 4 = 19 4 pens, the unit price of the pen is: 19 19 4 = 4 (yuan each).

The unit price of a ballpoint pen is: (19-4 3) 7=1 (yuan per piece).

Teach you how to do it. 1. Suppose there are x rabbits, then there are 12-x chickens, then there are a total number of legs = x * 4 + (12-x) * 2 = 32, calculate x is OK, x = 4

That is, there are 4 rabbits and 8 chickens, 4*4+8*2=32

It's simple, but it's too much.

4500 5 900 (box) This is the original daily production.

5500 5 1100 (box) This is now the daily production.

1100—900 200 (box).

So now 200 boxes more toys are being produced per day than before.

This question asks how many more boxes of toys are produced per day than in the past, so it is necessary to calculate how many boxes of toys were produced per day in the past and now: 4500 boxes of toys have been produced in the past 5 days, and 4500 boxes 5=900 boxes have been produced per day. Now 5500 boxes are produced in 5 days, and 5500 = 1100 boxes are produced per day, so it can be seen that the number of toys produced per day is now more than in the past

1100—900 200 (box).

It turned out to be 4,500 boxes in 5 days, which is equivalent to 900 boxes in 1 day.

Now 5500 boxes in 5 days, which is equivalent to 1100 boxes in 1 day.

1100—900 200 (box).

This one is simple.

Start with 4500 5=900

Another 5500 5 = 1100

Finally, 1100-900=200

Mingming: 23 4 = 23 4 = 5 and 3 4 (km).

Bright: 17 3 = 17 3 = 5 and 2 3 (km).

Strong: 11 2 = 11 2 = 5 and 1 2 (km).

5 3 4 > 5 2 3 > 5 1 2;

Obviously > bright > strong;

To know how to find the volume of a cylinder, you can first find the radius of the bottom surface of the cylinder, and then use the volume formula of the cylinder.

Divide the 8m side into 2m quarters, and connect the three dots in the middle with A.

Process: s = 1 2 * bottom * height, so that the height has been 12m, divided into four equal parts, 8 into 4 2.

s per plot = 1 2 * 2 * 12 = 12

One person on the left and one on the left and one on the top and one on the top and bottom of a table; There are two people at the top and bottom of the two tables, one on the left and one on the left.

It is easy to know that n tables can be 2n + 2 people, and you can substitute 4 5 into the calculation.

Take 3 points d, e, and f on the short side of the right angle, and divide them into four segments, each of which is 8 4 = 2 meters. Connect point A separately, the area is equal, and they are all 12*2*1 2=12

The 8-meter right-angled side is quartered and connects point A with 3 equal points.

The side with a length of 8 meters is divided into 4 sections equally, that is, there are 3 equal points, and the three equal points are connected to point A, and the area of the four blocks is 12 square meters, the principle is: the bottom edge of each triangle is 2 meters, and the height on the bottom edge is 12 meters.

Divide the 8-meter side equally at 3 points and connect them with point A.

Divide the 8-meter-long side into 4 equal parts, and connect the 3 equal points to point A.

My exam papers are the same as yours.