It looks like an elementary school question, an elementary school question

According to the sinusoidal theorem.

ab/sinc=ac/sinb

So sinc=ab*sinb ac=1*((root2) 2) root2=1 2

So c = 30 degrees or 150 degrees.

And because ab is less than ac (big side to big angle).

So the angle c is less than the angle b

So the angle c = 30 degrees, so the angle a = 180 degrees - 45 degrees - 30 degrees = 105 degrees.

So triangle ABC area = (1 2) * 1 * root number 2 * sin105 degrees.

Root number 2) 2*sin (60 degrees + 45 degrees).

Root number 2) 2 * ((root number 6 + root number 2) 4) ((2 * root number 3) + 1) 8

Let ab=c, ac=b, bc=a

by the cosine theorem.

The cos angle abc=(a 2+c 2-b 2) (2ac) can be obtained by substituting the known conditions, bc=( 2) 2+( 6) 2 and the triangle area formula:

s=1 2sin angle abc*ab*bc=+[(6)+(2 3)] 8

2 3 A = 4 5 B.

10 A = 12 B.

A: B = 12:10 = 6:5

A is proportional to B, and their ratio is constant.

Solution: Let the number A be x and the number B be y, then 2x 3=4y 5, x:y=4x3 2x5=12:10=6:5

Therefore, the two numbers of A and B are in (positive) proportion, and the simplest integer ratio of the two numbers of A and B is (6:5).

3 2 A = 5 4 B.

A: B = 5:6

The ratio of the corresponding two numbers must be 5 to 6

3 2 A = 5 4 B.

6 A = 5 B.

The ratio of A and B is certain.

Solution: Set A and B to transport x tons, only Tong according to the topic:

500-x=5*(340-x) Qiaoshan Zhi.

The solution is x=300

The remaining tonnage of A Xiaoxiao is: 500-300=200 and the remaining tonnage of B is: 340-300=40

300 tons were shipped out, 200 tons were left in A and 40 tons were left in B.

Mathematically, 4 cucumbers are equal to 3 potatoes, then one cucumber is equal to one potato, 4 eggplants are equal to 4 potatoes, then 1 eggplant is equal to 1 potato, 4 radishes are equal to 5 potatoes, then one radish is equal to one potato, so then one cucumber plus one eggplant and one radish is equal to 3 potatoes. (The premise is that it is calculated on an average basis).

If it's a brain teaser, a cucumber plus an eggplant and a radish equals a bunch of vegetables.

This question can be assumed.

Set up a year. 11+a）x2=36+a

The solution is a=14

After 14 years, you're 25 and your dad is 50, and you're going to be able to subtract twice your age from your dad's age.

Climb 5 meters during the day, drop 3 meters at night, and only climb 2 meters a day.

13 (5-3) = days, six and a half days.