6th grade 1st semester math problems, 6th grade first semester math problems

If you look at the fan as a circle and the circle ratio behind it, their radius ratio is 2:1, and it stands to reason that the area ratio should be 4:1, or the area should be 4 times his, and now the area is the same, then this fan is only 1 4 of the circle just thought, that is, 1 4 of 360 degrees, so it is 90 degrees.

Solution: r = (x 360) (2r).

x/360×4=1

x=90, so the scallop is rounded at a corner of 90°

Let the radius of the circle be r, then the radius of the sector is 2r.

Because s round = s fan.

i.e.: r 2 = (n 360) (2r) 2n 360) = r 2 (2r) 2

n=（360*πr^2）/π（2r）^2

n=360/4

n=90

Suppose a circle has a radius of 1

The area of this circle is:

The rounded angle of the sector is x degrees.

x=90

90 degrees. The area of the park is equal to r

The area of the large fan-shaped garden is equal to 4 r

Because the sector is equal to the area of the circle.

So the fan is 1 4 of this fan garden, so it's 90 degrees.

1.It is necessary to calculate the ratio of the second hour of travel to the whole journey: 1-20%-65%=15%, so the whole journey = 4 (20%-15%)=80km2

The difference between the radius of the inner and outer rings is 5cm, the diameter difference is 10cm, and then the length difference of the reed is 10*3(1) Mother pays tax = (2000-1600) * 5% = 20 yuan to eliminate the belt.

2) Since 1600 + 2000 = 3600 has to pay tax: 2000 * 10% = 200 yuan, that is, the salary can be 3600-200 = 3400 is greater than 2885, and 2885 is much greater than 1600 + 500, so Dad should pay 10% tax.

2885-1600 = 1285 yuan is 90% of the tax part, so the tax part is: 1285 90% = yuan.

So Dad's pre-tax income = 1600 + yuan.

4. 1260+y%=1827

y%=567

y=56700

10%y=y=y=y=2

1.The distance is set to x km.

x=20%x+20%x-4+65%x

x=802, in fact, how much longer is the red line than the yellow line, is to find the perimeter of the outer ring of the lead base and subtract the perimeter of the inner ring, let the radius of the inner ring be r, that is.

Therefore, the personal income tax paid is 400*5%=20 yuan.

2) The title is not finished.

4. 1260+y%=1827

y%=567

y=56700

10%y=y=y=y=2

1.The distance is set to x km.

x=20%x+20%x-4+65%x

x=802, in fact, the red line is longer than the yellow line, and the lead base is how much is to find the perimeter of the outer ring minus the perimeter of the inner ring, and let the radius of the inner ring of the front cluster be r, that is, Huai Annihilation.

Therefore, the personal income tax paid is 400*5%=20 yuan.

4. 1260+y%=1827

y%=567

y=56700

10%y=y=y=y=2

1.The distance is set to x km.

x=20%x+20%x-4+65%x

x=802 In fact, how much longer is the red line longer than the yellow line, Lu Lao is to find the circumference of the outer ring of the liquid minus the perimeter of the inner ring, and let the semi-positive ascending diameter of the inner ring be r, that is.

Therefore, the personal income tax paid is 400*5%=20 yuan.

2) The title is not finished.

4. 1260+y%=1827

y%=567

y=56700

10%y=y=y=

y=2 and answer.

*Centimeter.

2. The circumference is expanded by 3 times and the area is expanded by 9 times.

3. The length of the iron wire is meters).

The square side is meters long.

Square area sqm.

4. The radius ratio, diameter ratio, and perimeter ratio are all 4:3 and the area ratio is 16:95, and the radius is 4 meters, and the perimeter meter is square meters.

6. Radius 15 cm Circumference cm Area square centimeter 7, the ratio of circumference and diameter.

Method 1:

Solution: I ate 1 4 on the first day, and there are left.

Ate the remaining 1 to 3 the next day

There are 3 4-1 4=1 2 left

On the third day, I ate the remaining 1 2, 1 2 1 2 = 1 4, and there was 1 2-1 4 = 1 4, which is 12.

So all is 12 1 4=48 (only).

Eat 48 1 4=12 (only) on the first day

Eat 48 1 4=12 (only) the next day

On the third day, eat 48 1 4=12 (only).

A: There are 48 peaches in this pile, and he eats 12 of them every day.

There were 12 peaches on the 4th day, then on the third day there were 24 (12 divided by 1 2) who ate 1 2, so the rest accounted for 1 2, then on the second day there were 36 (24 divided by 2 3) who ate 1 3 and the rest accounted for 2 3, then on the first day there were 48 (36 divided by 3 4) ate 1 4 and the rest accounted for 3 4, so the monkey picked a total of 48 peaches and ate 12 on the first day, 12 on the second day, and 12 on the third day.

If there are x in total, then x(1-1 4)(1-1 3)(1-1 2)=12x*1 4=12

So x=48 on the first day 1 4*48=12 two 1 3*36=12

Three 1 2*24=12

There are 48 peaches in total, and 12 are eaten every day.

The problem is to find the greatest common divisor of three numbers.

The greatest common divisor of 18 24 30 is 6

So each section can be up to 6 meters long.

It can be solved altogether.

18 6 + 24 6 + 30 6 = 12 (segments).

The greatest common multiple is 6, so:

Each section is up to 6 meters long.

There are 12 paragraphs in total.

Start by making their greatest common divisor 6, which is 6 meters.

6 meters, the first root is three sections, the second root is four, and the fifth root is five.

I didn't know what topic you wanted, so I looked for some:

1. Choice. Five-twoths of the quotient is compared with a, and the correct one is (agreater than abMinor fuss or a

c.Equal to adLess than or equal to a

2.Apples are eleventh and thirteenth more than pears, pears are 13 kg less than apples, and apples weigh (kg.

3.This year's output is 15% higher than last year's, and this year's output is equivalent to last year's (2. Calculation. 1) Calculation, easy liquid to be able to be easy.

17/18 + (5/6-1/4) 9/716/8 3/4-2-2/9 * 3/4

1 and 1 out of 5 3 out of 5

18/5 x 18/5 * 18/5

Solve equations. 7*

3. Solve the problem.

1) Xiao Ming: It takes me 10 hours for Guan Pei to type this manuscript.

Xiaohua: It takes me 8 hours.

2) Milk sugar yuan kg.

Fruit sugar in kilograms.

Halva yuan kg.

Mix milk candy, fruit candy and halva 3:4:2 to make assorted sugar.

How much is a kilogram of assorted sugar?

3) Multi-vitamin beverage juice content 15%.

The juice content of the drink is 35%.

The juice content of Jiajiale drink is 10%.

Fruit juice multi-drink, juice content 12%.

The net content of a box of multivitamin drinks is 560 ml, how many ml of juice is in this box of drinks?

4) The sixth grade class bought back 30 language books and 28 mathematics books, and spent a total of yuan, each language book is more expensive than each mathematics book. How much is each language book and math book?

Solution: [72 (1-1 9)] 16=64 16=4 (tons).

A: The average cargo transported per vehicle is 4 tons.

72x(1-1 9) 16 = 64 16 = 4 tons.

A: The average cargo transported per vehicle is 4 tons.

16 divided by (1-1 9) = 18 cars.

72 divided by 18 = 4 (tons).

A: The average cargo transported per vehicle is 4 tons.

72x(1-9 1)=64(t) 64 16=4(t).

A: The average cargo transported per vehicle is 4 tons.

1-1/9=8/9

16 8 9 = 18 (car).

72 18 = 4 (tons).

A: The average cargo transported per vehicle is 4 tons.