Math Problem Binary Primary A Binary Mathematics Problem

Solution: In this transportation plan, Beijing should transfer X station to Wuhan and Y station to Chongqing; Shanghai should be transferred (6 x) to Wuhan, (8 y) to Chongqing, according to the theme, get.

x+y=10 --1

4x+8y+3(6-x)+5(8-y)=76 --2 simplify2 to get x+3y=18 --3

3 -1 get.

2y=8 y=4

x=6 So 6 units were transferred from Beijing to Wuhan and 4 units to Chongqing; Shanghai doesn't need to transfer to Wuhan, only 4 units need to be transferred to Chongqing.

Process: If this kind of transportation plan is set up, Beijing should transfer X station to Wuhan and Y station to Chongqing; Shanghai should be transferred (6 x) to Wuhan, (8 y) to Chongqing from the ** freight of each unit can be known

Beijing-Wuhan costs 4x 100 RMB

Beijing-Chongqing costs 8y hundred yuan

Shanghai-Wuhan costs 3 (6 x) 100 RMB

Shanghai-Chongqing costs 5 (8 y) hundred yuan

The total is 7,600 yuan, or 76 hundred yuan

Result: Solution: In this transportation scheme, Beijing should transfer X station to Wuhan and Y station to Chongqing; Shanghai should be transferred (6 x) to Wuhan, (8 y) to Chongqing, according to the theme, get.

Simplification can be understood.

So 6 units were transferred from Beijing to Wuhan and 4 units to Chongqing; Shanghai doesn't need to transfer to Wuhan, only 4 units need to be transferred to Chongqing.

Let A's velocity be x km/h and B's velocity be ykm/h.

1 hour and 15 minutes are hours.

The system of equations can be obtained from the meaning of the title.

Solution: by equations

x＋y＝20

y＝20－x………

Substitute the equation into the equation

x 11 substituting x 11 into the equation

y＝20－11＝9

Solution: x 11

y 9 A: A has a speed of 11 km/h, and B has a speed of 9 km/h.

A + 2v B =

Five-quarters (v A + v B) =

Proof: Because AB is parallel to DF

So a= f

And because de parallel bc

So def= bca

Because ae=cf

So ae+ce=cf+ce

i.e. ac=ef

So def def(sas).

So b= d

By ab df, the inner misalignment baf= dfa

By de bc, the internal wrong angle def= bca

According to the sum of the inner angles of the triangle is 180°, i.e. BAF+ BCA+ B= DFA+ DEF+ D=180°

Then: b= d

Ac=Fe from AE=CF and two groups of parallel to each other to obtain two sets of equal angles, and two triangles are congruent, and the conclusion will be obtained

1.Let the velocity of A be x and the velocity of B be y, A will start for two hours and then go for hours, then there is + =36 B will start for two hours and go for 5 hours, then there will be 3x + 5y=36 to solve this equation and get x=6 , y=

2.Let the length of the train be x and the speed be y

2x + 1000=60y

1000-x=40y;

Let the velocity of A be a and the velocity of B be b.

2a+(a+b)*

2b=(a+b)*3=36

a=6b=Let the length be a and the velocity be b

1000+a) b = 1 minute.

1000-a)=40/60

a = 200 meters. b = 1200 m min.

Let the area be half after x seconds.

6-x）（8-x）=24x=2

After 2 seconds, the area of PCQ is equal to half of the area of ABC!

Make use of the given self-knowledge formula:

Then substitute the solution into the obtain:

When x=3, the original formula = 3-1=2

When x=-3, the original formula =-3-1=-4

The dumbest method can be used to evaluate plus or minus 3.

From the equation, we can see that a 2=2010a-1, and the following equation is brought in to obtain 2010a-1-2009a+2010 (2010a) after simplifying to obtain a-1+1 a general score, and then bringing in a 2=2010a-1 again, the result of simplification is 2009

Solution: Let each branch grow x branches.

Then: the main trunk is 1, the branch is x, and the branch is x 2

According to the meaning of the equation: x 2 + x + 1 = 91

x^2+x-90=0

x+10）*（x-9）=0

Solve x1=-10 (discarded if it doesn't fit the topic).

x2=9A: Each branch grows 9 small branches.

1, 3 times the root number 6 + the root number 24-9 times the root number 1 54 = 3 times the root number 6 + 2 times the root number 6-9 * [1 (3 times the root number 6)] = 5 times the root number 6-1 2 times the root number 6 = 9 times the root number 6

Time is limited, not your own computer, only this one pulls!!

1.Original formula = 3 6 + 2 6- (81 54) = 5 6- 6 2 = (9 6) 2

2.？？Let's be clear.

3.What is the root number 10 times 2 3?

4.Original = 4 + 10 + 4 10-12 + 4 10 = 2 + 8 10

1.Original formula = 3 6 + 2 6- (81 54) = 5 6- 6 2 = (9 6) 2

2.I don't understand the title.

3.What is the root number 10 times 2 3?

4.Original = 4 + 10 + 4 10-12 + 4 10 = 2 + 8 10

The square of a + the square of 4b - a + 4b + 5 4 = the square of 0a - the square of a + 4b + 4b + 4b + 5 the square of 4 = 0a - a + 1 4 + 4b square + 4b + 1 = 0 (a - 1 2) square + (2b + 1) square = 0a - 1 2 = 0 2b + 1 = 0

a=1/2 b=-1/2

Note that the question is about the square root, not the arithmetic square root.

(-ab)=±√(1/2*(-1/2))=±1/2

The square of a + the square of 4b - a + 4b + 5 4 = 0, = (a - 1 2) 2 + (2b + 1) 2 = 0a = 1 2

b=-1/2

square root of ab = 1 2