Ask how to solve this problem, and how to solve this problem

Faced with the problems of life, Li Bai also once "had to be happy in life", but finally had an epiphany, and wrote the sentence "Straight to the clouds and sails to the sea". Su Shi, who is "a lonely grave for thousands of miles, with nowhere to talk about desolation", gained valuable sobriety in the process of solving the problem. On the way to Dengzhou, Fan Zhongyan looked down on the impermanence of the world and the ups and downs of the sea, and solved the problems of life with the mind of "not happy with things, not sad with yourself".

The problem is ***, perhaps it is the cynicism he encountered when he "studied for the rise of China"; The problem for Carl Benz may have been the scorn he received when he first conceived the idea of a three-wheeled car; The problem for Gu Fangzhou may be the embarrassment of no one to encourage research when it is in a bottleneck. The phrase "I'm too difficult" that became popular on the Internet contains the helplessness and sadness of contemporary youth: some people fail the exam, some people are not understood, and some people are distressed that they can't get a return ......for their hard workLife is like a rosary made up of a string of troubles, and who can count them with a smile?

can be born as Peng, and he should aspire to the North Sea. The pearl of luminous light does not have to come from the river of Mengjin; It does not have to be mined in the Kunlun Mountain. Didn't the *** who was ridiculed hold the spark with both hands and ignited the glory of China?

Didn't Carl Bentz, who had suffered a lot of blindness, create the magic of science and technology and realize the rhapsody of the times with his will? Gu Fangzhou, who studied alone, didn't he use his hard work and poor years to write the miracle of "Grandpa Sugar Pill"?

In the face of life's problems, young people should have the heart of a hundred flowers, have the ambition of Lingyun, and contribute to the progress of the times. When the banner of the May Fourth Movement fluttered in the streets and alleys, brave and tenacious young people used their drums and calls to call for the trend of an era; When the flames of the War of Resistance Against Japanese Aggression spread and burned in the land of China, the young people who would never admit defeat used their blood and flesh to protect their homeland; When the spring breeze of reform and opening up blows the green land of China, the young people who work hard sincerely use their strength and strength to build a better future ......The best attitude in the face of problems is not "moss flowers are as small as rice, but also like peonies blooming", and isn't it "not forgetting the original intention and forging ahead"?

Young people catalyze history and add luster to the world. Our generation of young people, Ye Ye is like Fusang, not afraid of hardship, not slacking off in hard work, not hesitating in confusion, aiming for thousands of miles, and moving forward. In the face of the severe challenges of the times and the difficult problems of struggle, we should ride the wind and waves to appreciate the majesty of the journey.

We firmly believe that stones will bloom and stars will speak.

And the new fire will try the new tea, and the poetry and wine will take advantage of the years.

Ask how to solve this problem, (1) s5=5a1+10d=35, a8+a10=2a1+16d=38, and the solution gives a1= 3, d=2, so an=2n+1.

At least one of the four data in the question is wrong (for example, the bottom edge of the triangle is long), and I don't know which data to answer the problem.

With the ratio, 4:3=; Triangle.

The height of the shaded part is.

So the area of the void-resistant part of the shadow is: 2.

I hope my Fierce Respect can inspire you. Chang Zhi is blind.

It is known that the height of the large triangle is 3 cm, and the height of the trapezoid below is 2 cm, so the height of the shadow triangle is 1 cm, and the area is 1 2 2 1 = 1 square centimeter.

Knowing that the radius is 2, we can find the distance from point c to ab. Set x if x<2, apart.

If x=2, tangent.

If x>2, intersect.

From the question, we know that x=bc*sin30=2 so tangent.

It is a tangential relationship, you should choose b, and the answer depends on the ** behind.

Hello, that is a sufficient and necessary condition for a system of equations to have a zero solution, and the sufficient and necessary condition for a system of equations to have a non-zero solution is that the value of the determinant of the coefficient matrix is equal to zero.

Potential, refers to the voltage value at a point in a circuit relative to the zero potential. Voltage, on the other hand, is often used in a broader sense to refer to the potential difference between any two points in a circuit. If the potential of both points is high, the voltage (potential difference) between the two points will not be very high.

Two. The switch is closed, and the point A potential is the voltage where the point potential is equal to AB.

UB=I*4K==4K*12 (4K+26K)=IIwhen the switch is turned on, the point B potential is equal to the voltage of point A plus AB.

ub=i'*(2k+4k)=i'*6k

6k*[12-(-12)]/(2k+4k+26k)=

a is a real number, don't overcomplicate it (

Let's talk about the answer first: multiply the first formula by (-3), multiply the second formula by 4, and then add the two formulas you get, and the answer will come out.

Let me illustrate -3

and 4 how the numbers are derived.

First of all, there are 3 unknowns and 2 equations, and in general, it is impossible to solve the specific size of xyz. My idea is to multiply the two formulas by a constant and add them together, so that the coefficients before xyz are the same. Because in this way, the coefficient before xyz can be eliminated to get the size of x+y+z.

Let the first formula be multiplied.

a, the second equation multiplies b

18ax10ay+2az=196a

13bx+7by+bz

126b is added, (18a+13b)x+(10a+7b)y+(2a+b)z=196a+126b

Because the xyz coefficient is the same.

18a+13b

10a+7b

2a+b gives 4a+3b=

0 means that as long as 4a+3b=

0, then. The first formula is multiplied.

a, the second equation multiplies b

The formula xy obtained by adding it up

The coefficient before z is the same.

Just let a=-3

b=4 is fine.

Another problem can also be used: consider z as a constant and solve it about x

A system of binary linear equations of y, (calculate x

##)zy=

##)z)x+y+z

You can also find the result directly. This method is more intuitive, but it is slightly more cumbersome than the above method.

This problem proves that subspaces are relatively difficult and require conceptual understanding.

1) Obviously x=nx1 order zero vector fn, then ax is a zero vector of mx1, so w is a non-empty subset of fm.

For any x1, x2 fn, w1=ax1, w2=ax2, then there must be a(x1+x2) is a vector of mx1, i.e. than w1+w2 fma(kx1) is also a vector of mx1, i.e., kw1 fm, so w is a subspace of fm.

2) To find the dimension and basis of w is to find the basic solution system and number of ax=0 equations, and substitute a to find it.