A cuboid shaped glass container, 40 cm long, 30 cm wide and 50 cm high, is waterproof and 3 decimeters high. Now there is a piece of iron in it, which is completely immersed in water, and the water level is 35 cm high. How many kg of iron is put in it (7.8 kg of iron per cubic decimeter)

Volume of iron block v = 40 × 50 × (35-30) = 10000 cubic centimeter = 10 cubic decimeter
Iron weight: 10 × 7.8 = 78 kg

A cuboid glass jar is 40 cm long and 30 cm wide. Now the depth of water is 12.5 cm. When an object is immersed in water, the height of water rises by 0.4 (the water does not overflow). Calculate the volume of the object
Every day I want to know the age of my father and grandfather, my father said to him with a smile: "the age of the three of us is 103 years old. My grandfather is 25 years older than me, and I am 27 years older than you." Can you tell the age of three people from dad's words?
It takes Liu Ying five hours to walk from a to B, and Shen Yun four hours to walk from B to a. Now they are traveling from two places at the same time. Two hours later, they are still 4 kilometers apart. How many kilometers is the distance between a and B?

It's going up 0.4 cm
40 * 30 * 0.4 = 480 (cm3)
It's going up by 0.4 decimeter
40 * 30 * 4 = 4800 (cm3)

C language calculates the value of the following formula s = 2 / 1 + 3 / 2 +. + m + 1 / m, in which the value of M is input from the keyboard

#include
int main(void)
{
float s=.0f,a=.0f,b=.0f; int i = 0,m = 0;
printf("m=?"); scanf("%d",&m);
if(m < 1) return 0;
for(i = 1; i

What does the Three Gorges mean?
Three canyons

The Three Gorges of the Yangtze River is one of the ten scenic spots in China. It starts from Baidi city in Fengjie County of Chongqing in the West and ends at nanjinguan in Yichang city of Hubei Province in the East. It is composed of Qutang gorge, Wuxia gorge and Xiling Gorge, with a total length of 191 km

When x tends to zero, is infinitesimal equivalent to SiNx_______ (for detailed explanation)

The best way to see if they are equivalent is to take the limit of the ratio of the two numbers
(x^2+sinx)/x
=x+sinx/x
Limit at X - > 0
x->0,sinx/x=1
So the limit is 1, so the two are equivalent
I hope you understand this general practice (⊙ o ⊙)

There are 10 good boys in a class, accounting for 1 / 3 of the total number of boys, and 3 / 5 of the total number of boys in the class?

10÷1/3÷3/5=50

5.32°=_ ″ 25920″= ° 23°29′+58°37″=__

5.32°=19152″
25920″= 7.2 °
23°29′+58°37″=81°29′37″

In the arithmetic sequence with 2n + 1 terms, if the sum of all odd terms is 165 and the sum of all even terms is 150, then n is equal to ()
A. 9B. 10C. 11D. 12

From the odd number term and S1 = (n + 1) (a1 + A2N + 1) 2 = (n + 1) × 2An + 12 = (n + 1) an + 1 = 165, ① even number term and S2 = n (A2 + A2N) 2 = n × 2An + 12 = Nan + 1 = 150, ② n + 1n = 165150, the solution is n = 10

There are three kinds of RMB, 1 yuan, 2 yuan and 5 yuan, with a total of 1000 yuan. It is known that the number of each kind of RMB is the same, so how many are there in each of the three kinds of RMB?

X+2X+5X＝1000
8X＝1000
X＝125
One yuan, two yuan and five yuan are all 125 sheets
That adds up to 1000 yuan

Find the rules, fill in the numbers and find the answers 2, 4, 3, 5, 6, 10

If you insist on it
If we look at the odd number terms, the third number 2,3,6, (), () is the product of the first two numbers
So the numbers in () are (18), (108)
The third number of even terms 4,5,10, () is a general expression of the product of the first two numbers
So the number in () is 25
The results were 2, 4, 3, 5, 6, 10, (18), (25), (108)

A cuboid shaped glass container, 40 cm long, 30 cm wide and 50 cm high, is waterproof and 3 decimeters high. Now there is a piece of iron in it, which is completely immersed in water, and the water level is 35 cm high. How many kg of iron is put in it (7.8 kg of iron per cubic decimeter)