Seven on the winter vacation homework on a question, help out, dear

Five Uniques: Dengle Youyuan " Li Shangyin The sunset is infinitely good, but it is just near dusk Tao Yuanming's poem "Drinking": "Under the east fence of picking chrysanthemums, you can see Nanshan leisurely. ”

Meng Jiao's "Wanderer's Yin" is on the line in his mother's hand, and the wanderer's shirt is topped.

Wen Tianxiang's "Crossing the Zero Ding Yang" has not died in life since ancient times, and he has a heart of sweat.

The young man does not work hard, and the boss is sad.

The moon is falling and the sky is full of frost.

Who knows that Chinese food is hard work.

Wildfires burn inexhaustibly, and spring breezes blow and regenerate.

The sunset is infinitely better just near dusk.

Picking chrysanthemums under the east fence leisurely see the South Mountain.

Mother's hand line wanderer's top.

Wildfires burn inexhaustibly, and spring breezes blow and regenerate.

The young man does not work hard, and the boss is sad.

Who knows that Chinese food is hard work.

Leave Dan to take care of the sweat (life since ancient times, who has not died).

The moon falls and the sky is full of frost (Jiang Feng Yuhuo has no sleep).

Don't write in parentheses because there are no words on it, I hope you thank you.

The sunset is infinitely better just near dusk.

Mother's hand line wanderer's top.

The young man does not work hard, and the boss is sad.

Picking chrysanthemums under the east fence leisurely see the South Mountain.

Wildfires burn inexhaustibly, and spring breezes blow and regenerate.

Who knows that Chinese food is hard work.

Keep Dan in mind.

Picking chrysanthemums under the east fence leisurely see the South Mountain.

Mother's hand line wanderer's top.

Since ancient times, who has not died, left Dan to take care of the sweat.

Wildfires burn inexhaustibly, and spring breezes blow and regenerate.

The young man does not work hard, and the boss is sad.

It's just that the sunset is infinitely close to dusk.

Who knows that Chinese food is hard work.

The moon is falling and the sky is full of frost.

Jiang Feng Yuhuo was sleepy.

The line in the hands of the loving mother, on the body of the wanderer. The sunset is infinitely better just near dusk. (I've only looked at it a little bit, and I'll help you find it all out when I have time someday).

Write it yourself, and I can help you take the exam when you take the exam! Please don't blame me for not telling you the answer.

Figure b-a=4

b-2a=5

So a=-11, b=3

Therefore, the origin is one square after a.

1) Condition: b-2a=5;

2) As seen in the figure: b-a=4;

(1) and (2) get a=-1, b=3;

The question is incomplete, please take a new photo.

Proof: Because DF is parallel to BC

So the angle adf = the angle abc

Angular AFD = Angular ACB

Because the triangle ABC is an equilateral triangle.

So ab=ac

Angle BAC = Angle ABC = Angle ACB = 60 degrees.

So the angle ADF = angle AFD = 60 degrees.

So the angle BAC = angle ADF = angle AFD = 60 degrees.

So the triangle adf is an equilateral triangle.

So ad=af=df

Because ef=de+df

ab=ad+db

de=db, so ab=ef

So ef=ac

Because the angle AFD = angle BAC = 60 degrees (proven).

ad=af (verified).

So the triangle AFE is equal to the triangle DAC (SAS).

The road is wide and the shoulders are broad.

Officiating a wedding creates life.

The wind is howling and the breeze is blowing.

The microwave ripples and the big waves are surging.

Excellent results and noble style.

Bright sunshine and bright moon.

Bright classrooms, fresh air.

Clean roads, beautiful singing.