Who told me how to do these questions, please, it s just a junior high school question

1。The number of sides of this polygon is n, the inner angles of the polygon are (n-2)180, and the outer angles are x (0 x<180).

then (n-2)*180+x=1350

n-2)*180=1350-x

1170<(n-2)*180<1350

n-2=7n=9

2.The number of sides of this polygon is n, the sum of the inner angles of the polygon is (n-2)180, and one of the inner angles is x (0 x<180).

then (n-2)*180 x=2750

n-2)*180=2750+x

2750<(n-2)*180<2930

n-2=16,n=18

3.The number of sides of this polygon n, the sum of the inner angles of the polygon (n-2)180, then n(100+140) 2=(n-2)*180

Solution n=6

1, the number of sides of this polygon n, the sum of the inner angles of the polygon (n-2) 180, the inner angles (n-2) 180 n

Degree of diplomacy 180-(n-2) 180 n

n-2)180+180-(n-2)180 n=1350 degrees, n=72, the number of sides of this polygon n, the sum of the internal angles of the polygon and (n-2)180, the internal angles (n-2)180 n

n-2)180-(n-2)180 n=2750n=183, the number of sides of this polygon n, the sum of the internal angles of the polygon and (n-2)180, the sum of the internal angles of the polygon = 100 + (100 + m) + ...140=（100+140）*n/2

n-2)180=（100+140）*n/2n=6

Then this polygon is 7+2 9

180＝15……50, so the number of sides of this polygon is 15+1+2 183 with n interior angles, and 100 140) n 2 (n-2) 180 then n 6

1170 180 = 6 more than 90 degrees.

This is a nine-sided shape with an outer angle of 90 degrees.

2. The same method, drawing, 2750 180 = 15 more than 50 degrees.

The inner angle that is not added is 130 degrees.

This is an 18-sided shape.

3. Let this be an n-side.

100+140)n/2=180(n-2)

n=6 then it is a hexagon.

Note that the first two questions need to be drawn and triangles constructed.

Addendum: In the old days, Wang Xie Tang Qianyan flew into the homes of ordinary people.

The sound of chickens is in the month of Maodian, and the track is frosty on the bridge.

I advise the heavenly prince to be vigorous and reduce talents without sticking to one pattern.

Ping Ming looked for the white feather, but he was not in the stone ridge.

Thousands of miles of yellow clouds and daylight, the north wind blows geese and snow.

The spring is silent and the water is soft.

The spring tide brings rain and comes in a hurry, and the wild ferry is unmanned and self-controlled.

Fill in the blank: 180

Idiom: a slump.

There is a ghost in my heart - (with a ghost in my heart) waiting for the rabbit - (the edge of the wood asks for fish) sending charcoal in the snow - (icing on the cake) the melon is ripe and falling - (it comes naturally).

Idioms: 1 is sluggish, 2 is troublesome, 3 is the initiator.

4 It is difficult for a good woman to cook without rice 5 A dream of Nan Ke 6 Green and yellow are not connected 7 The voice is boiling 8 Vientiane is updated.

From left to right, the number of the first term is m, the second term is m-1, the third term m the fourth term is m-2

The last 2 terms are constant terms and the number of times is 0

Because the requirement is 4 times trinomial, so m=4

At this point, m-2=1 so bring in the original formula to get x 2*y 2+4*x 2*y+n*x 3*y-2*x*y+4+n

And because it's a 3nomial, only n+4=0, so n=-4, m=4, n=-4

Junior high school is not so difficult.

Because, acd= b, a= a The defeated mountain circle is similar to the triangle ABC with the triangle ADC.

Then ab:ac=ac:ab from this it is concluded that ac=6 and because, acd= b, af is the angle of bac, so the triangle abf is similar to the triangle aec.

So ae:ac=ac:ab gives ae=6

Kid, I'm in college, and I'm doing literature, I haven't touched math for many years, and I'm wrong.54

1d According to the interpretation, it means before he realizes it.

If you choose another option, e.g. C, 3 hours have passed since he found out (no).

ps;Of the two actions that took place at different times in the past, the one that occurred in the former and the one that was completed in the past is used; Occurs in the post, with simple past tense.

Note: If two actions happen immediately after that, the past perfect tense is often not used, especially in compound sentences that contain before and after, because the order in which the actions of the subordinate clause and the actions of the main clause occur in such a way is very clear, then the simple past tense can be used instead of the past perfect tense.

2b The first half of the sentence means: Children, this is your test paper. Who's willing to help me.

a. Pick it up, b. Distribute the test papers, c. Look up the dictionary, d. Let them out (the grammar is also wrong).

.It is clear that only B is smooth.

In 3c grammar, when but is said to be "except", the principle of "there is do without to, and no do adds to" should be followed, that is to say, in "he does nothing but wait", do appears before but, and the to after but should be omitted.

4d is not possible in the perfect tense because the sentence starts with this morning, and c is in the future tense, which must be wrong, and the only thing left is d.

5d uses adverbs lately, often unluckly, luckly, etc.

1.According to the meaning of the sentence, it should be before he understands it, so it is used before

Pick up, b distribute, c browse, d is not syntaxal.

It is followed by the provincial infinitive.

4.State past facts in the simple past tense.

Adverb, recent.