Cut a cube with an edge length of 8 cm into two cuboids of the same shape and size. The volume () and surface area () of each cuboid

Cut a cube with an edge length of 8 cm into two cuboids of the same shape and size. The volume () and surface area () of each cuboid

The volume of each cuboid (8 × 8 × 8 △ 2 = 256 cubic centimeters), surface area (8 × 8 × 6 + 8 × 8 × 2) △ 2 = 128 (square centimeters)

The original price of a commodity is 100 yuan. After the price is reduced by 10%, the price is increased by 10%. How much is the current price?

100-100X1/10
=90
After the price reduction, it's 90 yuan
90+90X1/10
=99
The current price is 99 yuan

1 (2) + 2 (2) + 3 (2) + 4 (2) + 5 (2) +. 123456789 (2) what is the number of single digits after adding? The meaning in brackets is square, for example, the first number is the square of one

1^2+2^2+3^2+...+n^2=n(n+1)(2n+1)/6
1. N = 123456789, the single digit is 5
2. If n = 123456789 is 9, then 9 + 1 = 10, 9 * 10 / 5 = 15 is 5, 2n + 1 is an odd number, then 5 times an odd number is always 5
To sum up, the single digit is 5

Math problems in the same cage
Twelve people paste matches, five for adults and two for children. Now there are 45 paste matches per minute. How many for adults and children

If you are all adults, you can paste 12 * 5 = 60
The number of children is (60-45) / (5-2) = 5
Adults are 12-5 = 7

It's very simple for you. Explain your ideas
Tiantian went to the supermarket to buy a doll and a pen. She misread the decimal point of the doll's price and paid 12.85 yuan in total. The cashier told her to pay 40.30 yuan. How much are the doll and the pen?

Set pen to X
Because it's 12.85, it's a doll that has missed one
(12.85-x)10=40.30-x

If you save 40 grams of water per person per day, how many kilograms of water can 1000 people save per month (30 days)?

1000×40×30
=40000×30
=1200000 (kg)
A: it can save 1200000 kg

Near antonyms and polysyllabic characters in the fifth grade Chinese Volume II

Kindhearted - friendly, warm - warm, hidden - hidden
Visit visit fear shine
Antonym: rugged - Flat destruction - protection intentional - unintentional
Polysyllabic character: LV
Pound Pang Bang

As shown in the figure, quadrilateral aefd and ebcf are parallelogram
Prove that the quadrilateral ABCD is a parallelogram

It is proved that both aefd and ebcf are parallelograms
∴AD∥EF,AD=EF; BC∥EF,BC=EF
∴AD∥BC,AD=EF
The quadrilateral ABCD is a parallelogram

How many times does the number 5 appear in the odd number series of 1, 3, 5.697 and 699?

Appear in 100 places: 501-599, 50 times
It appears in the ten digits 51-59151-159251-259351-359451-459551-559651-659
A total of 5 * 7 = 35 times
It appears in position 05-695
70 times in all
All in all, 155 times
Have a good time with your math

Please give me the answer
Are the words in brackets correct
1.The woman was (at a loss) what to do as she was frightened by the gun of the attackers.
A. Wrong B. right
2.I didn't go to the party,but I do wish (I had been) there.
A. Wrong B. right
3.(Nobody and a young woman) survived the airplane crash.
A. Wrong B. right
4.The computer doesn't work well,so something (must have gone wrong.)
A. Wrong B. right
5.I don't like the desk because it (takes up) too much space.
A. Wrong B. right
6.Although Mary (is satisfied to) her success,she wonders what will happen to her private life.
A. Wrong B. right
7.There is(no point to try) to change his mind once he is determined to carry out the plan.
A. Wrong B. right
8.The little boy saw the plane( to crash) and burst into flames.
A. Wrong B. right
9.English (is used by) more people than any other language except Chinese.
A. Wrong B. right
10.Anyone is likely to commit mistakes,(no matter however) careful he is.
A. Wrong B. right

1B at a loss 2A should be had gone there 3A should be no body but a.4b tense correct 5B take up means occupied 6A should be satisfied with 7a should be no point doing sth.8a saw should be the whole process rather than this action