Xiao Ming's father gave him a birthday gift box on his birthday. He knows that the length, width and height of the gift box are 40cm, 30cm and 10cm respectively. If the gift box is tied up with ribbon (the ribbon at the knot is 18cm long), how many centimeters of ribbon do you need

Xiao Ming's father gave him a birthday gift box on his birthday. He knows that the length, width and height of the gift box are 40cm, 30cm and 10cm respectively. If the gift box is tied up with ribbon (the ribbon at the knot is 18cm long), how many centimeters of ribbon do you need

Horizontal week is 30 + 10 + 30 + 10 = 80, straight week is 40 + 10 + 40 + 10 = 100, total is 80 + 100 + 18 = 198

Ming Ming's birthday, my father bought a cake. The cake box is 20 cm high and the ribbon is 2.3 meters long. (30 cm is used at the knot). How many square meters of material does it take to make the cake box? (the number is reserved for two decimal places). The cake box is a cylinder

I've just finished it. It's six simultaneous exercises
2.3m = 230cm
230 minus 30 = 200 cm
200 minus 20 × 4 = 120 cm
1204 = 30cm
30 × 3.14 × 20 = 1884 square centimeter
15 square × 3.14 × 2 + 1884 = 3297 square centimeter = 0.3297 square meter ≈ 0.33 square meter
I made it myself!

If there are 38 people in each car, there are 13 people without seats. If there are 42 people in each car, then there are still three vacant seats. How many cars do you rent? How many people are there in the summer camp

38x+13=42x-3
4x=16
X = 4
Total number = 38 * 4 + 13 = 165

The sum of the reciprocal of two consecutive natural numbers is 11 / 30. What are the two natural numbers?
Please write the formula,
Calculate by arithmetic

1/a+1/b=11/30
(a+b)/ab=11/30
a+b=11,ab=30
a=5,b=6

A general term formula of sequence 2 / 2 (power 3 of 2) - 1,3 / 3 (power 3 of 3) - 1,4 / 4 (power 3 of 4) - 1

It's the observation of the law
an=[(n+1)³-1]/(n+1)

Mr. Zhang and Mr. Wu led 76 students to play. Each van is limited to 9 people. How many vans do they need to rent at least?

There are two teachers and 76 students, a total of 78, 78 / 9 = 8 ···· 6
There are six people left, so we have to rent another van, 8 + 1 = 9
Nine in all

LIM (when x tends to infinity) (2x + 1) / √ (X & # 178; + 3) =?

If you change 2x + 1 to √ (2x + 1) ^ 2, the original formula will be changed to (2x + 1) ^ 2 / (X & # 178; + 3) under the root sign, and then use the lobita rule twice inside the root sign to get 2

Let two of the equations LG & # 178; X + (LG2 + Lg3) · lgx + LG2 · Lg3 = 0 be X1 and X2, then the value of x1 · X2 is

According to the meaning of the title, lgx1lgx2 = LG2 · Lg3
Lgx1 + lgx2 = - (LG2 + Lg3)
lgx1x2=-lg6
x1x2=-1/6

I want to buy a birthday present for my mother?

I want to buy a birthday present for my mother
I want to buy a birthday gift/present to my mother.

How many meters is eight meters and five centimeters

Equal to 8.05m (the conversion unit of CM and M is 100 times)