Newspaper math problems, math newspaper speed, master on 5 questions process.

199 yes.

100th - 99th = 100

99th - 98th = 99

Add up to 100th - 98th = 199

The rule is: the first number is 1 = 1

The second number is 3 = 1 + 2

The third number is 6 = 1 + 2 + 3

The fourth number is 10 = 1 + 2 + 3 + 4

The fifth number is 15 = 1 + 2 + 3 + 4 + 5

The 98th number is 1+2+3+......98

The 100th number is 1+2+3+......100

Subtract to get 199

Loud days are joyful, and happiness is everywhere in life.

As Helen said, there are people in normal health who no longer feel precious about some things in this world. However, all people will cherish happiness forever.

Some people say that happiness is short-lived, but I think that every moment of life is full of happiness. Every morning when I wake up, when a ray of light enters my room through the curtains, I feel the sun, how happy it is.

Walking into the campus, a few withered yellow leaves fall down, don't feel sorry for them, the dead leaves fall, new leaves will grow, and new life will be born. What a joy!

In class, we are happy when the teacher affirms our progress. When the teacher criticizes, I think, this is my shortcoming, I usually don't find it, but now the teacher reminds me, then there is one less shortcoming in me, you must know that the fruit has become plump because of criticism. Isn't that happy?

Our life is full of happiness, as long as you love life and face life positively and optimistically, happiness will always belong to you.

Loud days are joyful.

- 6/5 * 1 6

Sell minus 6/11 and sell 36/41

3. [The absolute value of (4-6)] divided by the disadvantage multiplied by 1001250 (m).

It should be good for Bu Zhan's understanding, because of some reason, I can only use words instead of those symbols.

There are 6 absolute values less than 5, so it is 6 10 = 60%.

There are 3 numbers with absolute values greater than 5 in the recorded results.

Pass rate: (10-3) 10=7 10=70%.

1. A is expressed as: 18000A-18000 1000*8*25-18000 1000*100

b is expressed as: 18000b

2. Bring a = and b = into the above formula, get the first kind = 18000 25200, get the second kind = 19800, or the first kind to sell in the market.

1.The first: 18000b

The second type: 18000-1800 1000 (8 25 100).2.

As can be seen from the question, the amount of the first type: 18000 The amount of the second type: 18000 100) = 22860The second.

Group 1: 3a+4b+x

Group 2 Size: (3a+4b+x) 2+6=

Group 3 Numbers: [(3a+4b+x)+

Group 4: 50-(3a+4b+x)-(

39-6a-8b-2x

It should be expressed in the formula containing a, b, and x, right? ）

2 (x-1 2) to the power of 2 + 丨y-1丨 = 0

The power of 2 (x-1 2) is positive, and the sum is 0, so they must each be equal to 0 to achieve this.

So (x-1 2)=0, x=1 2=

y-1=0, y=1

b=（2*3b-24=3*（

Why is A useless? Is there a copying error?

Also, does "2x to the 2nd power" mean 2x*2x?Or 2x*x? )

Question 1: The second group has (3a+4b+x) 2+6, and the third group has 3 2a+2b+x 6+16 3, then the fourth group is the total number of people minus the first group and then the second group and then the third group.

The second question has the meaning of the question, x, y satisfies the equation to get 2(x-1 2) 2=0, x=1 2, 丨y-1丨=0, y=1, and bring these two values into the equation you are looking for.

1) The first group has (3a+4b+x) people and the second group has [(3a+4b+x) 2]+6 people.

The third group has [(3a+4b+x) 2]+5 people.

Then the fourth group has = (39-6a-8b-2x) person 2) has the question 2 (x-1 2) to the power of 2 + 丨y-1丨=0 knowing that the sum of two numbers greater than or equal to 0 is equal to 0, then both numbers are 0 to get x=1 2, y=1

Then: a=5 4 ,b=-3 then 3b-24=-33 by the way, does a make sense in this way? Isn't it 3b-2a there.

1。According to the title.

Angle A is greater than angle B is greater than angle C

4 angle c is equal to 7 angle a

And because the angles a, b, and c are integers.

So the angle a is a multiple of 4.

Angle c is a multiple of 7.

So it can be set. Angle a is equal to 4x

Angle c is equal to 7x

So angle a plus angle b plus angle c is equal to 180 degrees.

4x plus angle b plus 7x equals 180 degrees.

So the angle b is equal to 180 degrees minus 11x

Guess it. When x is equal to 11. Eligible.

At this point, the angle b is equal to 59 degrees.

Greater than or equal to b and greater than or equal to c

A is equal to 2c, 2c is greater than or equal to b, is greater than or equal to c

3C plus B equals 180 degrees.

b maximum is 2c

That is, 3 angles c plus 2c equals 180 degrees.

Angle c is equal to 36

then the angle b is equal to 72

The minimum of b is c, that is, 3 angles, c plus angle c, equal to 180 degrees.

The angle c is equal to 45 degrees.

then the angle b is equal to 45 degrees.

So 45 degrees is less than or equal to angle b and less than or equal to 72 degrees.

3. Let the two sides of the triangle be a, and one side is b, then 2a plus b is equal to 2.

A is less than 1000 B is less than 1000

999 b999 c2

2. a，998 b998 c43. a，997 b997 c6。。

b501 c998

So there are 499 species in total.

,b=59,c=77 process: list a**, define c=7c 4, b=180-b-c=180-11a 4, try it, b is getting smaller and smaller, a is getting bigger and bigger, and finally it is an integer, and a<=b<=72 generations. Replace a with c, b = 180-a-c = 180-3c and c is the maximum b , so b lower limit: b = 180-3b, lower limit 45

In the same way, if a is used instead of c, b = 180-a-c = and a is the smallest is b, so b is on the line: b = and the upper limit b = 72

Computers can also be simulated. But it can be written like this: Suppose both waists are x, and the bottom edge is y, y must be even, otherwise x is not an integer, because x=(2000-y) starts from 2 and becomes larger, 2, 4, 6, 8, ,......998, when y becomes 1000, x=500, at this time it is no longer possible to form a triangle, so it is meaningless for y to continue to get bigger.

So if there are 499 numbers between 2-998, there are 499 isosceles triangles.

1.Let the angle a be x degrees, the angle c is 7 4 x degrees, and the angle b is 180-x-7 4 x degrees. x must be an integer, then it must be divisible by 4, when x=4,8,12,16....

40,44,..Only when x = 44 will the question be satisfied, a is less than b, b is less than c, and the angle a = 44 degrees, the angle b = 59 degrees, and the angle c = 77 degrees is found.

Another example, a=b>=cSubstituting c into the solution of two inequalities.

3.If the two sides are equal, the sum of the perimeters must be even.

Even - Even = Even.

So the bottom edge is also an even number.

The sum of the two sides of the triangle is greater than the third side.

So the bottom edge is less than 2000 2

There are even numbers within 1000. 998 excludes 0, 499 in total.

So there are 499 isosceles triangles with integer sides and 2000 circumferences.

The 1st floor is full of crap ......

1.Let the angle a be 4x, the angle c is 7x, because the sum of the inner angles of the triangle is 180°, so the angle b+a+c is the factor of 180, and because 4x《angle b<7x, so the angle b is.

The main study of the total is the unary equation. Horn. There are also positive and negative numbers.