Can 34 divide by 4 / 9 times 1 / 3 be simplified

Can 34 divide by 4 / 9 times 1 / 3 be simplified

Can 34 divide by 4 / 9 times 1 / 3 be simplified
Can't;
Original formula = 34 ÷ (4 / 9) × 1 / 3
=34×9/4×1/3
=34×3/4
=51/2;
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55 + 54 + 53 + 52... + - 44, the solution (≥ 1 ≤)

44 and - 44 offset

The suitable method to improve the power factor of inductive load circuit is (). The reason is given
The appropriate method to improve the power factor of inductive load circuit is ()
A. Connect a suitable capacitor in series with an inductive load
C. The resistance of appropriate size is paralleled at both ends of inductive load
B. Parallel capacitors of appropriate size at both ends of inductive load
D. Connect a suitable resistor in series with an inductive load

The appropriate way to improve the power factor of inductive load circuit is (B. parallel capacitors of appropriate size at both ends of inductive load)
Generally speaking, the voltage on the inductor is ahead of the voltage on the capacitor. For a certain frequency of AC, the size matching inductor capacitor parallel circuit can be equivalent to a pure resistance circuit, and the power factor is improved

If B = {0,1,2,3,4,7,8}, C = {0,3,4,7,9}, then the set of a contained in B and a contained in C has__ individual

If B = {0,1,2,3,4,7,8}, C = {0,3,4,7,9} satisfies that a is contained in B and a is contained in C, then the possible elements in a are: 0,3,4,7, so there are a total of 2 ^ 4 = 16

As shown in the figure, points c, D and e divide the line segment AB into four parts. Given AC: CD: de = 2:3:4:5. CE = 14cm, find the line segment
As shown in the figure, points c, D and e divide the line segment AB into four parts. Given AC: CD: de = 2:3:4:5. CE = 14cm, find the length of the line segment ab

∵AC：CD：DE：EB=2：3：4：5
Let AC = 2x, then CD = 3x, de = 4x, EB = 5x
Then CE = CD + de = 7x = 14
∴x=2
∴AB=AC+CD+DE+EB＝14x=28CM.

Does the contract require that the matrix be real symmetric
Such as the title
The definition of contract is defined in the quadratic part
Quadratic matrices are all real symmetric. Is it true that the contract is only for real symmetric matrices?

You can understand it that way
The purpose of introducing congruent transformation is to study quadratic form. It is enough to study congruent transformation for real symmetric matrix (or Hermite matrix)
This is not to say that the general matrix can not do the congruent transformation, but if the transformation matrix is not orthogonal matrix (or unitary matrix), the congruent transformation has little significance

The position relation between point P (4, m) and circle X & # 178; + Y & # 178; = 15 is

√(4²+m²)=√(16+m²)>√m
That is, the distance from P to the center of the circle is greater than the radius
So outside the garden

Higher mathematics integral ∫ xsinx / [1 + (cosx) ^ 2] DX
For definite integral:
π
∫ xsinx/[1+(cosx)^2]dx
0
Where 1 + (cosx) ^ 2 means: 1 plus the square of (cosx), π is Pai
It's better to have a detailed problem-solving process.

π arctan (π / 2) π∫ xsinx / [1 + (cosx) ^ 2] DX 0 π / 2 = ∫ xsinx / [1 + (cosx) ^ 2] DX 0 π + ∫ xsinx / [1 + (cosx) ^ 2] DX π / 2 let x = π - t, then π / 2 ∫ (π - t) sin (π - t) / [1 + (COS (π - t)) ^ 2] DT 0 be changed to π / 2 ∫ (π - t)

There are three groups of numbers a, B and C, a = {1, 3, 5, 7}, B = {2, 4, 6}, C = {9, 11}. Take a number from each group and multiply it to get a product. The sum of these 24 products is______ ．

According to the analysis, the sum of these 24 products is: (1 + 3 + 5 + 7) × (2 + 4 + 6) × (9 + 11) = 16 × 12 × 20 = 3840

A mathematical problem of addition, subtraction and elimination~
(1)4s+3t=5 (2)5x-6y=9
2s-t=-5 7x-4y=-5

1:4s+3t=5 (1)
2s-t=-5 (2)
(1)-2*(2)
5t=15 t=3,s=-1
2:5x-6y=9 (1)
7x-4y=-5 (2)
(1)*2-(2)*3
-11x=33 x=-3,y=4