Elementary school students 6th grade math problems two solutions .

It's okay to calculate pi, and people in small Japan have calculated to more than 200 million decimal places.

1.Set the number of attacks to make tops with x rice cloth x 3 2 (600-x) 1 m 240 1 = 240 (set side void) 3360 meters of cloth for shirts and 240 meters of cloth for pants, a total of 240 sets of potatoes can be produced.

1.Calculated by formula: 280 (2+4 3)=20

There are x rabbits, there are y chickens, and the title can be obtained.

x=3y1）4x+2y=280

2) Solution: (1) 4, substituting (2), you can get 4x=12y

12y+2y=280

14y=280

y=20x=60

There are x chickens, which can be obtained from the title.

2x+4（3x）=280

2x+12x=280

14x=280x=20

- There are x rabbits, which can be obtained from the title.

4x+2（x÷3）=280

4x+2x÷3=280

12x+2x=840

14x=840

x=6060÷3=20———2.Boys have: (80 90-90 73) (80-70)=63

There are girls and girls: 90-63=27

There are more boys than girls: 63-27=36.

160-120 = 40, 1 3 of red balls, 1 4 of yellow balls, 1 5 of white balls, a total of 40.

160-116 = 44, 1 5 of red balls, 1 4 of yellow balls, 1 3 of white balls, a total of 44.

So the difference between the 1 3-1 5 of the white ball and the 1 3-1 5 of the red ball is 4 4s (1 3-1 5) = 30

The difference between white and red balls is 30.

2 3 of red ball, 3 4 of yellow ball, 4 5 of white ball for a total of 120 red balls of 4 5, yellow ball of 3 4, white ball of 2 3 for a total of 116 red balls 2 3 + 4 5, yellow ball 3 4 + 3 3 4, white ball 2 3 + 4 5 for a total of 120 + 116.

That is, 22 15 of the red ball, 3 2 of the yellow ball, and 22 15 of the white ball, a total of 236 red balls + yellow balls + white balls = 160

Red Ball 3 2 + Yellow Ball 3 2 + White Ball 3 2 = 160 3 2 = 240 (240-236) (3 2-22 15) = 120 The sum of white and red balls is 120.

120+30) 2=75 white balls.

120-30) 2=45 red balls.

160-120 = 40 yellow balls.

Solution: Set the red ball x, the yellow ball y, and the blue ball z, and calculate the amount by yourself.

Let the red and yellow orchids be x, y, and z respectively, then.

x+y+z=160

1/3x+1/4y+1/5z=120

1/5x+1/4y+1/3z=116

Together, x=45, y=40, z=75

If I originally bought x table tennis balls and y badminton balls, there are:

2x+4y=100；

2y+4x=92；

Solution: x=14;

y=18；I used to buy 14 table tennis balls and 18 badminton.

Solution: Suppose that badminton is x, table tennis is y

Then there is: 4x+2y=100

4y+2x=92.

To solve this system of equations, we get:

x=18 (pcs).

y=14 (pcs).

A: It turned out that there were 14 of these table tennis balls.

Badminton is 18 pcs.

Hope it helps.

1.According to the topic, it costs a total of 6 yuan to buy a badminton and table tennis ball, and the two joint purchases can add up to get a total of (100 + 92) 6 = 32.

2.According to the unit price, a table tennis ball is replaced with a badminton, and the cost is increased by 2 yuan; If a badminton ball is replaced with a table tennis ball, the cost is reduced by 2 yuan.

The cost before and after the replacement is reduced by 8 yuan, and the original table tennis ball is 4 less than badminton, according to 1 and 2, it is easy to get the original table tennis ball with 14 and badminton with 18.

If you have studied equations, even binary equations, this problem is easier to solve.

Set badminton x, table tennis y

4x+2y=100

2x+4y=96

Directly we can get x=18 y=14

Number of table tennis balls 2 + number of badminton balls 4 100

Number of table tennis balls 4 + number of badminton 2 92

Number of table tennis balls + number of badminton balls = (100 + 92) 6 = 32 pieces 100 32 2 Number of badminton balls 2 36

Number of shuttlecocks 18

Number of table tennis balls 32 18 14

Elementary school students have never learned equations, so they use this method to solve them.

Total number = (100 + 92) 6 = 32

Number of badminton balls (100 32 2) 2 18Number of table tennis balls 32 18 14

Set x table tennis balls and y badminton balls.

Then: 2x+4y=100

2y+4x=92

Solution: x=14; y=18

So: 14 for table tennis and 18 for badminton.

There are x number of badminton balls. There are y table tennis balls.

Get a system of binary equations.

4x+2y=100

2x+4y=92

Solve x,y.

Set up to buy these table tennis balls x pcs, badminton y pcs.

4x+2y=100 2x+4y=92

x=18 and y=14

Set feathers a and ping pong b. According to the meaning of the question, 4a+2b= solution a=18, b=14

Let the number of badminton balls be x and the number of table tennis balls be y, the equation 4x+2y=100, 2x+4y=92, and the calculated result x=18 and y=14. So there are 14 in table tennis and 18 in badminton.

1.The greatest factor of the two numbers is 15, the least common multiple is 180, and the uncle is not a multiple of the decimal number, these two numbers are (

This is the process of bringing down.

These two numbers are: 15 3 45, 15 4 60 (calculation process.

1）2)1/2+(1—7/12x8/7)

3)(1/5+4/5x1/8)÷1/5

1 1 25)1110 [11x(5 11—5 13)x13] Some may not be simple.