Primary 6 Reflection Questions, Primary Mathematics 6th Grade Reflection Questions.

A, B, and C are inserted into the same pool, and the sum of the length of the three sticks is 270 cm, A has 3 4 outside the water surface, B has 7 10 outside the water surface, and C has 2 5 outside the water surface, how deep is the water?

Solution: Set the depth of the water x cm.

x÷(1-3/4) x÷(1-7/10) x÷(1-2/5)=270x÷1/4 x÷3/10 x÷3/5=2704x 10x/3 5x/3=270

9x=270

x = 30 A: The depth of the water is 30 cm.

1. There is a car with a circumference of 65 12 meters in the front wheel and 19 3 meters in the rear wheel. So, when the car advanced how many meters, the front wheel ran 198 laps more than the rear wheel?

Grade 6 can use equations to set up a run of x meters.

x/(65/12) +198 =x/(19/3),x=7410

Arithmetic: When the rear wheel runs 1 lap, the front wheel runs 19 3 (65 12), the front wheel runs 19 3 (65 12) -1 = (19*12-65*3) (65*3) laps, and the rear wheel runs 198 [(19*12-65*3) (65*3)] laps when the front wheel runs 198 laps.

Distance = (19 3)*198 [(19*12-65*3) (65*3)]=7410 meters.

2. The teacher wrote on the blackboard a number of consecutive natural numbers starting from 1, and later erased one of them, so that the average of the remaining natural numbers was 44 and 24 29. Which number is erased?

Suppose n numbers are written, the sum of these n numbers is n*(n+1) 2, and the average number is (n+1) 2

The smaller the number of erases, the greater the average of the remaining numbers, and the larger the number of erases, the smaller the average of the remaining numbers.

The average of the numbers after erasing 1 is (n+2)(n-1) (n-1) 2=(n+2) 2

The mean of the erased numbers after n is (1+n-1)(n-1) (n-1) 2=(n-1) 2

n-1) 2<44 and 24 29<(n+2) 2, n is an integer.

87+19 29 After erasing one, the remaining number multiplied (number minus 1) must be an integer, only 88 satisfies.

So at the beginning there are 88 numbers, and the sum = n*(n+1) 2=3916

After erasing a number, the sum = (44 + 24 29) * 87 = 3900

The number of erased is 3916-3900=16

The cost of the goods is 360 (1 25%) 288 (yuan) The cost of the hail goods is 360 (1 25%) 480 (yuan) The total cost is: 288 480 768 (yuan).

Loss: 768 or guess 360 2 48 (yuan).

1.The volume of the cone is 10*6*1 3=20 cubic centimeters.

Cut off 40 cubic centimeters.

2.9*3=27 cm.

Very simple. 1: Cutting off is 2 3 of the volume of the cylinder

2: 3 times the height of the cylinder: 27 cm.

1.To process a batch of parts, A does it alone for 20 days to complete, and B does it alone to complete 1 30 of this batch of parts per day. Now the two of them are working together to complete this batch of parts, A has a day off halfway through, and B has also rested for a few days, so it takes 15

1.Ten times six times two-thirds equals forty.

2.Nine times three equals twenty-seven.

Ten 3 (1-2 3) = 9

Single digit 9-3 = 6

This two-digit number is 96

Let the number of tens be.

x=9，9-3=6

This two-digit number is 96

If the number in the ten place is subtracted from 3, it is equal to the number in the single place. Explain that the number in the tenth place is 3 greater than the number in the single place

Thus on the ten digits it is 3 (1-2 3) = 9

It is 9-3=6 in the single digit

This number is 9*10+6=96

Cut x meters of each of the two pieces of fabric.

148-x=3(100-x)

3x-x=300-148

2x=152

x = 76 first cloth left = 148-76 = 72 meters.

The second piece of cloth left = 100-76 = 24 meters.

To solve the equation, suppose we cut x meters 148-x = (100-x) times 3

All cut off 76 meters.

One is 72 meters left, and one is 24 meters left.

Zhang didn't give Li a **, Zhang didn't bring Li's hat.

Liu wanted to hit **, Liu happened to be on the phone with Li Zai when he called, Zhang didn't call Li **, then it must be Guan Zai to call Li **, so Liu Zai gave Guan **, so Liu brought Guan's hat.

Since Liu brought Guan's hat, Li didn't have Guan's hat, so Li couldn't give Guan **, it was Guan who brought Li's hat.

Zhang didn't have a hat with Li, nor did he have a hat with Guan (which Liu carried), so Zhang brought Liu's hat.

Then Liu brought Guan's hat, Zhang brought Liu's hat, Guan brought Li's hat, and Li brought Zhang's hat.

From "After going home, everyone gave the owner of the hat a **." Zhang didn't call Li **. It shows that Zhang is not wearing Li's hat, and the sentence "The person who Liu wants to beat ** happens to be talking to Li Zai when Liu calls" just deduces that the person Liu wants to beat ** is Guan, Guan wears Li's hat, Liu wears Guan's hat, because they are all taken wrong, so Li wants to take Zhang's hat, therefore, Zhang's hat is taken by Li.

1, Zhang didn't give Zhao Li **, so the only people who gave Zhao Li ** are: Liu Heguan.

2. Liu called ** to someone, and this person happened to be on the phone with Li. It shows that Liu did not give Li a **. According to the above conclusion, it is only about calling ** to Lee. Then Liu Da**'s person can only be Guan.

It can be seen comprehensively: Guan Dai's hat;

Liu Daiguan's hat;

Li wears Zhang's hat;

Zhang wears Liu's hat.

20% off the price: 1150 yuan.

Cost: 920 (1+15%)=800 RMB.

On the basis of 20% discount, another 150 yuan will be made, and the selling price is:

920-150 = 770 yuan 800 yuan.

The merchant loses money. Hope it helps!

20% off the price: 1150 yuan.

Cost: 920 (1+15%)=800 RMB.

On the basis of 20% discount, another 150 yuan will be made, and the selling price is:

920-150 = 770 yuan 800 yuan.

The merchant loses money.

The merchant loses, because after the 80% discount is 1150*, 920 can make a profit of 15% 920, and the merchant will make a profit of 150 on the basis of 1150 80%, and the merchant will lose 30.

I don't know if I'm right!

1150 times 15% equals the yuan.

Because" 150

So profitable.

When the merchant sells at a 20% discount, the price is 1150 yuan, and the cost is 920 (1+15%)=800 yuan. Another 150 yuan, the selling price is: 920-150 = 770 yuan less than the cost of 800 yuan. So the merchant loses money!

Solution: If the area of the overlapping frontus is 1, then the area of A is 4, and the area of Chang of B is 9, then the area ratio of the two triangles of A and B is:

4:9=4 9

Is the square bordered by the circle? If yes, that's how it works:::: The sum of the squares of both sides of the square is equal to the square of the diameter of the circle!! i.e. 2a 2 = 100

a=50、、、 under the root sign to find the area of the circle and the area of the square can be subtracted!!

The length of the two diagonal lines of the square is the diameter of the circle. Just use the Pythagorean theorem to find the length of the sides of a square

The area of the circle is subtracted from the area of the square

The area of the garden is 10 divided by 2 times 5 times the area of the square, and the area of the square is 10 times 10, and then the area of the circle is subtracted from the area of the square.