Good math come soon, good math come on

Steps: Because these two angles are co-angles with each other, and there are common edges, so angle a + angle b = 90 degrees, and because the bisector of angle a is divided into angle 1 and angle 2, and the bisector of angle b is divided into angle 3 and angle 4, so angle 1 = angle 2, angle 3 = angle 4, so 2 angles 1 + 2 angles 3 = 90 degrees, and the equivalent amount of substitution obtains:

2 (angle 1 + angle 3) = 90 degrees, so get angle 1 + angle 3 = 45 degrees = angle a, so the answer is b

I don't know if you understand it if you write it like this, you can't write a mathematical adjunct here, haha

Conclusion: Step B:

The two corners are co-angles with each other.

The sum of the two corners is 90

The two lines are bisected at two corners.

The angle between the two bisectors is 1 2·90 = 45

I don't know how you choose, the answer should be b, it's not good to draw here, so the writing is not very standard, you can draw the picture yourself, and then change the answer, if you are too lazy to change, this answer can also be done).

d The two corners are divided on both sides of the common side, and the angle is 45 degrees.

The two angles are divided on the same side of the common edge, and the angle is less than 45 degrees, greater than or equal to 0 degrees (0 degrees if and only if the two angles are equal).

Pick B How do you learn mathematics, you can draw any corner like this, and this is the answer

b Hehe, I didn't see the topic clearly, I must review the question carefully next time!

Why don't you have mathematical notation, you see: *-+

1 Set the price to be $x according to the title.

Solve x=20 (yuan).

2 Set the athlete to have x people, and the funding is y yuan according to the title.

y-7x=140

10x-y=100

Solve this system of equations to get it.

x=80 (person).

y=700 (yuan).

Question 1:

So the total weight of flour is 10 50+

Question 2: m).

Therefore, the snail only rose by meters, less than 3 meters, so it could not climb out of the wellhead Question 3: Notice that after removing the first number 1 from this column, the sum of every 4 numbers in the back is 0 and 2009 = 1 + 2008 = 1 + 4 502

Therefore, the sum of the first 2009 numbers after removing 1 in the first 2008 numbers is 0, so the sum of the first 2009 numbers is 1

Question 1: The sum is kilograms.

Question 2: You can't climb out of the wellhead.

Equation: <3, so you can't climb out of the wellhead.

Question 2: Discover this rule: from the second term, 2+(-3)=-1;（-4）+5=1；6+（-7）=-1；（-8）+9=1:；…2002+（-2003）=-1 ；（2004）+2005=1。

A total of 2006-2=2004 items are counted, and the sum of the two adjacent columns is 0, and finally 1+2006 is left, and the sum is 2007

1. 50x10+

2.So I didn't climb out and there were meters from the wellhead.

3.From 1 to -2008 every group of four there are a total of 502 sets and each set sum is minus 4, which adds up to minus 2008, plus the last 2009, the answer is 1

Question 1:

Question 2: No, you can't. Because he climbed up.

Question 3: 1005

1, 2, no, the sixth time to reach the place.

Question 1: 50*10+ =

Question 2: + So you can't.

Question 3: Divided by 1, there are 2008 numbers, all of which are positive one plus negative one, so the result is 1+0=1

The absolute value of m+4 + (n-3) to the power of 2 = 0, then mn + m to the power of 2 = (64).

2. When n is a positive integer, (-1)2n to the power = (1), 1) 2n+1 to the power = (-1).

3. If m is greater than 0 15 n is less than 0, then mn( <0 ;

Students, you have to study hard, in fact, the questions are not difficult, even if you have just learned these, it should be the foundation.

(1) Obtained from the question|2m+4|=0 (n-3) 2=0, so m=-2 n=3 then (mn+m) 2=64 (2) even, odd (3) mn 0

1. Because the absolute value of 2m+4 and the power of (n-3) are both positive, it is impossible to have a positive and negative situation, and only the case is 0, so we get m=-2, n=3, and the rest is calculated by ourselves.

n is an even number, 2n+1 is an odd number, think for yourself.

N less than 0 means that n is negative, and m is greater than 0, so mn is less than 0 and agrees with the first floor.

Solution: (1) 1 5, 8 5

So between these two numbers, it can be 41 56, 3 4, 43 56, 11 14, 45 56, got it? ^_

Ai: You guys! Is it doing homework why there are so many simple questions, these questions the teacher will say, you have to learn to do it yourself, what do you do with the exam if it's always like this?

10 times 10 = 100 minus 4 = 96 divided by 4 = 24

Hopefully, thank you!

The number of false propositions is ( ).

Two triangles with equal area are congruent triangles.

The three angles correspond to the two triangles that are equal are congruent triangles and the circumferences of congruent triangles are equal pairs.

Two triangles with equal angles on both sides and one of them are congruent triangles with no edges and corners.

c is only true, so there are three false propositions.

Each feeding is 24 hours, i.e. 1 day.

So the 10th feed, remove the first one, and there are 9 more.

Therefore, 4 days and 12 hours should be added.

That is, 8 o'clock in the morning on July 10.

Feed every 12 hours, and the 10th feed at 8 a.m. on July 10

Analysis: The first feed is 8 p.m. on July 5, the second time is 8 a.m. on July 6, the third time is 8 p.m. on July 6, the fourth time is 8 p.m. on July 7, the fifth time is 8 p.m. on July 7, the sixth time is 8 p.m. on July 8, the seventh time is 8 p.m. on July 8, the eighth time is 8 a.m. on July 9, the ninth time is 8 p.m. on July 9, and the tenth time is 8 a.m. on July 10.

If this time is counted as 0 times at 8 o'clock on July 5, 10 12 hours is 5 24 hours = 5 days, the 10th time is 8 o'clock in the evening on the 10th, if this time is counted as the first time at 8 o'clock on July 5, then it is 9 12 hours, which is 4 and a half days, and the 10th time is 8 o'clock in the morning on the 10th.