Grade 3 math questions were answered correctly and additional marks were given

The living room of Kobayashi's house should be paved with floor tiles, and there are two design schemes.

Scheme 1: The square side length is 5 decimeters, 20 yuan per brick, and the second plan is 6 decimeters per brick, and each brick is 26 yuan.

1) The first design uses 144 floor tiles to calculate the area of this living room.

5 5 25 (square decimeter) 25 144 3600 (square decimeter) 36 (square meter).

2) How many floor tiles are needed for the second design option?

3600 (6 6) 100 (blocks).

3) Which design is cheaper?

20 144 2880 (yuan).

26 100 2600 (yuan).

2880 yuan is greater than 2600 yuan.

The second design option is cheaper.

Hope it helps.

Scheme 1, each block area = 5 * 5 = 25 square decimeters.

So the living room area = 25 * 144 100 = 36 square meters.

Option 2: Area per block = square meters.

So 36 pieces.

Plan 1 is 144 * 20 = 2880 yuan.

The second plan is 100 * 26 = 2600 yuan.

So option two is cheaper.

1. The area of each square is 5*5 = 25 square decimeters, so the area of this living room is 25*144 = 3600 square decimeters.

2. The area of this square is 6*6 = 36 square decimeters, then you need to use 3600 floor tiles 36=100 pieces.

3. The first plan uses 144 * 20 = 2880 yuan, and the second plan uses 26 * 100 = 2600 yuan.

So the second option is cheaper.

1) square meters).

2) 3600 (6*6)=100 (blocks).

3) Plan 1: 144 * 20 = 2880 (yuan) Plan 2: 100 * 26 = 2600 (yuan).

Option 2 is cheaper.

1) 5*5*144=3600 square decimeters.

2) 3600 (6*6)=100 (blocks).

3) 144 * 20 = 2880 yuan 100 * 26 = 2600 yuan.

The second design option is cheaper.

The living room is 36 square meters; with 100 bricks; Cheap with a second set of tiles.

What's the second option!! Is this a question?

1. Fill in the fraction cubic centimeter = (cubic decimeter cubic meter cubic meter = (2400) cubic decimeter.

2. Put 1 and 4/7 5 7 9/16 in order from smallest to largest. Seven-fifths, one-and-four-sevenths, sixteenth-nines.

3. A cuboid is 8cm long, 5cm wide and 5cm high, and its surface area is (210) square centimeters.

4. Cut off the largest cube from the cuboid block in the above question, its surface area is (150 square centimeters) and the volume is (125 cubic centimeters).

5. A rectangular swimming pool, 25m long, 15m wide, deep, tile on the bottom and around the bottom of this pool, how many square meters of tiled area, if the water depth in the pool is meters, how many cubic meters of water are in the pool. (There is a process in the application question).

25x15+ sq.m.).

cubic meters) 6, the sum of the edge lengths of a cube is 96 decimeters, its surface area is (384 square decimeters) and the volume is (512 cubic decimeters).

Big brother, I've been typing for so long, so I'll give it a minute!

1 (1 500) (2400 1) 2 7/5<1 and 4/7< < 163/9 (210).

4 (150 cm²) (125 cm³) 5 (15

471 (sqm).

cubic meters) 6 (384 square decimeters) (512 cubic decimeters).

2, 7/5< 1 and 4/7 < 163/9, 210

1 5000 24000 7<1 105 4 7 << 16 9

210150cm2 125cm3 Water: 25 times 15 times Area: (25 times 2 times 2 + 15 times 25.)

384dm2 512dm3

cubic centimeter = (cubic decimeter) cubic meter = (2400) cubic decimeter.

1. cubic centimeter = (cubic decimeter cubic meter cubic meter = (2400) cubic decimeter 5 1 and 7 square centimeters.

4. The surface area is 150 square centimeters, and the volume is 125 cubic centimeters, 450 cubic meters.

6. The surface area is 384 square decimeters and the volume is 512 cubic decimeters.

1 question 0,0002 2400.

2 questions: 7/5< 16<1,75<113/7 Questions: (8 5) + (5 5) + (8 5) 2 = 210 (square centimeters) 4 questions: 150 square centimeters, 125 cubic centimeters.

1)an=1/[n*(n+1)*(n+2)]+1/(n+1)[1+n*(n+2)]/n*(n+1)*(n+2)][n+1)*(n+1)]/n*(n+1)*(n+2)](n+1)/[n*(n+2)]

2) The law is 1*2 for the first time2nd 3*4. The third time is 5*6, and the nth time is (2n-1)*2n

3)3(a²+b²+c²)-a+b+c)²=03a²+3b²+3c²-(a²+b²+c²+2ab+2bc+2ac)=0

2a²+2b²+2c²-2ab-2bc-2ac=0a²-2ab+b²)+b²-2bc+c²)+a²-2ac+c²)=0a-b)²+b-c)²+a-c)²=0

So a-b=0, b-c=0, a-c=0

a=b，b=c，a=c

A=B=C triangle ABC is an equilateral triangle.

If you don't understand something, just ask it).

Question 1: On the first day, when the time is set up, there is still 35*5=175 meters from the school, and on the second day, it is assumed that after arriving at the school, it is more than the school at the specified time

50 * 7 = 350 meters, the difference in the distance traveled in two days: 175 + 350 = 525 meters, why is there a difference? Because the speed difference between the two days is 50-35=15 meters, the normal time taken is:

525 15 = 35 points. Then the distance from his home to the school is: 35*(35+5)=1400 meters.

Question 2. Xiaojun walks at the pace of the first day from Hebi's house to school: 1400 35 = 40 minutes, if it is 7:0 in the morning

25 departure to Minqing School is: 7 hours 25 minutes + 40 minutes = 8 hours 5 minutes, that is to say, the time to school is 8:05

Question 3. Xiaojun goes to school at the pace of the next day, from home to school: 1400 50 = 28 minutes, 8 hours - 28 minutes = 7 hours 32 minutes, so he should leave before 7:32 to ensure that he will not be late for school.