5 / 8 of a is equal to 5 / 9 of B. A: B = (): ()

5 / 8 of a is equal to 5 / 9 of B. A: B = (): ()

8:9

Let a be a matrix of order n, rank (a) = n-1, and be two different solutions of the system of homogeneous linear equations AX = 0, then the general solution of AX = 0 is
Let a be a matrix of order n, rank (a) = n-1, X1 and X2 be two different solutions of the system of homogeneous linear equations AX = 0, then the general solution of AX = 0 is_____
The options are a.kx1 and b.kx2
C．k(x1 +x2 ) D．k( x1- x2)

Complete the question
Let a be a matrix of order n, rank (a) = n-1, X1 and X2 be two different solutions of the system of homogeneous linear equations AX = 0, then the general solution of AX = 0 is kx1 or kx2 (x1 or X2 is not equal to zero, that is, it cannot be a zero solution), where k is an arbitrary number

It takes six minutes for a part to be manufactured, five minutes for B and four minutes for C. now there are 1590 parts to be manufactured at the same time
How many parts should each person assign to complete the task in the next year?
What's more, the sum of all the edges of a cuboid is 360 cm. The ratio of its length to its height is 3:2: what's the volume of the cuboid?

1. Three people have the same working time. Let X be x / 6 + X / 5 + X / 4.5 = 1590. Solve the equation and get 22.5x + 27x + 30x = 214650x = 2700. That is to say, the working time is 2700 minutes. So x / 6 = 450 for a, X / 5 = 540 for B, and X / 4.5 = 600 for C. 2

If only one side has a denominator, how to go? For example, 3 / 2 minus x minus 2 / 4 minus X or 2 / 3 minus x = 2 / 4 minus x
It's wrong. It's 3 / 2 minus x minus 2 / 4 minus x equals 2. I made it up to write how to go to this denominator. Can I write down the specific process again? There's another one. Add another one. X minus 1 / 3 plus x = 2. Help me add another 10 points

① 3\2-X-2\4-X=2
3\2-X-1\2-X=2
1-2X=2
-2X=1
X=-1\2
② X-1\3+X=2
2X=2+1\3
X=7\6
I am the original answer, you calculate in the points!

Niucun has three granaries, of which a accounts for 25%. If C gives 16 tons to a and 7.5 tons to B, the three granaries are equal. How many tons does Niucun have
I don't know how to solve this problem. Who can help me explain it

In the end, one third of each granary,
At the beginning, a had 1 / 4 (25%), and C gave a total of 1 / 3-1 / 4 = 1 / 12
16 tons is equivalent to 1 / 12 of the total
Use 16 △ 1 / 12 = 16x12 = 192 (tons)

Use the equation to solve the following problems. 1. 20% of a number is more than 40% of 70. 2

X*20%-2=70*40% X=150

2 / 5 of a number is 16. What's 3 / 8 of this number?

16÷2/5×3/8
=40×3/8
=15

It is known that the common ratio of {an} is q = 3, the first three terms and S3 = 13 / 3
Find: (1) the general formula of {an}; (2) if f (x) = asin (2x + b) (a > 0, O)

(1)a1+3a1+9a1=13/3 a1=1/3 an=(1/3)*3^(n-1)=3^(n-2)
(2)a3=3 A=3 sin[2*(π/6)+b]=1 sin(π/6+b)=1 0

Simple calculation of 36 × (1 / 12 + 2 / 9 + 5 / 6)

36×﹙1/12+2/9+5/6﹚
=36×1/12+ 36×2/9 +36×5/6
=3+ 8 +30
=41

Given the set a = {A2, a + 1, - 3}, B = {A-3, 2a-1, A2 + 1}, if a ∩ B = {- 3}, then the value of a is ()
A. A = 0 or - 1B. A = 0C. A = - 1D. A = - 2 or 0

Let a ∩ B = {A-3, 2a-1, A2 + 1}, if a ∩ B = {-3}, {A-3 = -3 or 2a-1 = -3 or A2 + 1 = -3, or A2 + 1 = -3 or A2 + 1 = -3, let a = 0 or a = -1, B = {-3-3, 2a-3, 2a-3, 2a-1, A2 + 1}, if a ∩ B ∩ B = {1, - 3}, this is not the problem; let a =; let let let a =; let let let let let a = let let let let let let let let a = 8745; B = {B = {B {{{1, - 3}; this is not the right; this is not the problem; this is not the problem; this is not the right; let; let let if the meaning of the question is satisfied, then a = - 1