The answer to the last question in the excellent textbook [sixth grade mathematics]

Fill in the blanks:

(1) There are 25 boys and 20 girls. Boys belong to girls () and girls belong to the whole class ().

(2) There are 300 poplars and 240 willows, of which ()% are poplars and ()% are willows.

(3) The ratio of safflower to yellow flower is 5: 4, with safflower more than yellow flower () and yellow flower less than safflower ().

(4) 20 tons is 25% more than () tons. () Tons are 20% less than 20 tons.

(5) The ratio of number A to number B is 2: 7, number A is less than number B (), and number B is greater than number A ().

(6)45 points = () 35 points = () 2.4 points = () points.

(7) The number of a 1/2 is equal to the number of b, and the ratio of a to b is ().

(8) The ratio of liquid medicine to water of a liquid medicine is 1: 3000, and the existing liquid medicine is 750g, so () kg of water should be added.

(9) Liping cut the 6/7-meter-long rope into small pieces with the same length, each length is () meters, and each length is 6/7 meters ().

solve an equation

8X- = 9.5x-5.3x= 12.6 X=30

1. A brand of computer is now 20% off, which is cheaper than the original price. 600 yuan, what is the original price of this brand of computer? What's the current price?

2. A bicycle, 200 yuan, is 20% off the original price. Xiaoming has a VIP card and can get a 10% discount. How much did Xiaoming spend on this car?

3. For the same sportswear, the promotion methods of the two shopping malls are different. A shopping mall: 50% off. Shopping Center B is on sale at a discount of 25%. This kind of sportswear will be 15% off the discount. Which mall is cheaper?

4. A batch of stainless steel plates should be added to the school canteen, and each stainless steel plate should be 5 yuan. 10% discount for Xinbai Mall and "buy eight and get one free" for Su Hong Mall. The canteen wants to buy 180 yuan. Please be a "staff officer" and calculate: which is more cost-effective?

5. Toy stores carry out promotional activities. The shallot spent less than 1 10 yuan and bought two of the toys. How much did a * * cost?

Calculate the following questions.

⑴ (4.7-3.2)× 14% ⑵ 2000×( 1+2. 1%)

⑶ ( - )÷ ⑷ × + ÷

(1)1The Osaka World Expo in Japan set a record of 64 million visitors in 1970, and the Shanghai World Expo in 20 10 is expected to reach 70 million visitors, a few percentage points higher than the Osaka World Expo in Japan.

⑵ 3500 trees were planted in a certain area in spring, of which 2 10 did not survive, so we should seek the survival rate of planting trees in spring.

(3) In a sports high jump test, 32 students in Class 6 (2) passed and the remaining 8 failed. Seek the success rate of high jump events in this class.

(4) Processing a batch of parts has completed 75% of the plan, and producing 600 pieces just finished the task. How many parts are there in this batch?

Judge.

(1) Today, all the students in Grade 6 125 are on duty, and the attendance rate 125%. ( )

2 A is 25% more than B, and B is 20% less than A. ()

(3) Add 10g salt into 10g water, and the salt accounts for 10% of the brine. ( )

Solve the problem:

(4) An ordinary 60-watt light bulb consumes 10 kWh per month. If you switch to energy-saving light bulbs, you can save 80% of electricity consumption every month. What is the monthly power consumption of an energy-saving light bulb?

According to the regulations of the state, personal deposits in banks are exempt from interest tax. Mom saved 10000 yuan in the bank for two years, with an annual interest rate of 2.79%. How much money can mom get back after the expiration?

Xiao Li's family is going to buy a color TV. They found that the prices of color TVs of the same model and specification were different in different stores. Ask the staff to help, which store is more cost-effective? How much cheaper is it than buying it in other stores?

Jiadian

1?o'clock

Original price (yuan)

5500

5000

discount rate

10% discount

15% discount

First, fill in the form.

chart

Radius ()

Diameter ()

Perimeter ()

Area (? )

circle

six

25. 12

ring

2 (inner ring)

8 (excircle)

Fill in the blanks.

(1) The circumference of a circle is () times its radius.

(2) Draw a circle with a circumference of 37.68 cm, and the distance between the two feet of the compass is () cm.

(3) The circular manhole cover has a radius of 3 decimeters and an area of () square decimeters.

(4) The diameter of the big circle is 5cm, the diameter of the small circle is 3cm, the perimeter ratio of the big circle and the small circle is (): (), and the area ratio of the big circle and the small circle is (): ().

5] Xiaoming wants to cut a circle with a diameter of 6 cm. He should at least prepare a square cardboard with an area of () square centimeters.

[6] Use two 12.56 decimeter iron wires, one in a square and the other in a circle. The ratio of square area to circular area is (): ().

select

(1) When the wheel rotates once, the distance traveled is exactly equal to () of the wheel.

① Radius ② Diameter ③ Perimeter ④ Area

(2) A circular flower bed with a perimeter of12.56m and an area of ().

①12.56m ②12.56m2 ③ 25.12m ④ 50.24m2.

(3) Draw a maximum circle on a rectangular paper with a length of 6 decimeters and a width of 4 decimeters, and the radius of the circle is () decimeters.

① 4 ② 3 ③ 2.5 ④ 2

(4) When the radius of the circle increases by 2㎝, the circumference of the circle increases ().

① 2∏ ② 4∏ ③ 2 ④ 4

Find the area of the shaded part in the picture below.

⑴ ⑵

(1) Minute length of the clock 1 meter. /kloc-how many meters did the needle tip of the minute hand walk?

There is a big clock hanging in a hall. Its hour hand is 35 cm long. How many centimeters does the needle tip of this hour hand 1 turn day and night?

3. Circle a round flower bed with a fence of 25.12m. What is the largest area of this flower bed?

Seventh day

1. There are two cycles, a big cycle and a small cycle. The circumference of the great circle is 18.84 meters. The diameter of a big circle is twice that of a small circle. What is the area of this small circle?

2. The outer diameter of the truck wheel is about1.2m. If the truck wheel rotates at an average speed of 250 revolutions per minute, how many kilometers can the truck run per hour?

The circumference of a square is equal to the circumference of a circle. The side length of a square is 6.28 meters. What is the area of a circle?

4. A DVD disc has a diameter of 12 cm and a small hole with a diameter of 1.5 cm in the center (as shown in Figure 1). The DVD has a radius of 2.3 cm to 5.5 cm on the upward side (as shown in Figure 2). How many square centimeters does it burn?

(The number shall be kept to one decimal place)

Fill in the blanks:

1、( )÷5=0.6==( ):40=( )%

2、( )∶20 = = 0.8 =( )÷ 15 =

3.( )︰ 10===( )÷20=( )%

4、 12:( ) =0.75==( )÷60=( )%。

5、 12:( )==0.6=48÷( )=( )%

6、0.5÷ 1.5=( ):3 = =( )%

7、0.25= =( )%=( )÷( )

8,24: () = (): 24 = 0.375 = () [percentage]

9、=0. 125=( ): 16=( )%

10, = (): 40 = ()% = () fold = () (decimal)

1 1、( )÷5=0.6==( ):40=( )%

12，()÷ 20 = (): 15 = () Decimal = ()%

13、( )÷8= =0.5=( )%=( ):( )。

14、3.5= =( )÷6= =( ):( )

solve problems

1. Deposit 5000 yuan in the bank for one year, with the interest rate of 2.25%. How much principal and after-tax interest can I withdraw after maturity?

2. Uncle Li wrote a novel at a fee of 4,600 yuan. According to relevant regulations, individual income tax shall be paid at 14% for the part that pays more than 800 yuan. How much is uncle Li's manuscript fee after tax?

Grandpa keeps 3000 yuan in the bank for a fixed period of one year, with an annual interest rate of 2.25%. How much does grandpa have to pay to pay 20% interest tax when he withdraws money at maturity? How much interest does grandpa have after paying taxes?

Li Nainai deposited 5000 yuan in the bank for three years, with an annual interest rate of 2.70%. After three years, the interest rate is 20% when withdrawing money. How much interest tax should Li Nainai pay? How much money can Li Can Nai Nai get back after paying taxes?

1, acrobat Li Ming took part in a performance and earned 2200 yuan. According to the individual income tax law, 20% of the balance after deducting 800 yuan from the performance income is subject to individual income tax. How much personal income tax should Li Ming pay after this performance?

2. Worker Master Liu regularly deposits his 5000 yuan bonus in the bank for two years, and the interest rate of the two-year fixed deposit is 2.70%. Withdrawals due are subject to 20% interest tax. How much interest tax does Master Liu have to pay to withdraw money at maturity? How much interest and principal can I get back after paying taxes?

The following is Li Ming's interest list of savings deposits in China Industrial and Commercial Bank. Please answer the questions according to this list.

China Industrial and Commercial Bank Deposit Interest List

Currency: RMB 65,438+February 28, 2009

Transaction serial number: ×××××××

account name

Li Ming

account number

××××××××××××

Seed storage

capital

kind

interest rate

interest