How to solve the problem of (3a squared-b squared-2ab) + (B squared-ab-2a squared)

(3a squared - 2Ab of B) + (b squared - ab-2a squared)
=（3a²-2a²）+(b²-b²)-(2ab+ab)
=a²-3ab
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Simplification: the square B of 3A - [the square B of 2A (the square B of 2ab-a) - the square of 4A] - AB = () (process)

5 (3A's Square b) - 4 (- AB's square + 3A's Square b), where a = - 1 / 2, B = - 1 / 3
Finding the value of an algebraic expression

5(3a²b)-4(-ab²+3a²b)
=15a²b+4ab²-12a²b
=3a²b+4ab²
=3(-1/2)²(-1/3)+4(-1/2)(-1/3)²
=3(1/4)(-1/3)+4(-1/2)(1/9)
=(-1/4)+(-2/9)
=-17/36

Logarithmic function f (x) = log2x, take any x1, X2 in its domain
And X1 is not equal to x2
3. F (x1) - f (x2) divided by x1-x2 is greater than 0

For. F (x) = log (2) x, x1 ≠ x2 domain: X ＞ 0, logarithmic function f (x), its base 2 ＞ 1, is increasing function x1 ＞ x2 ＞ 0, f (x1) ＞ f (x2) = > [f (x1) - f (x2)] / (x1-x2) ＞ 00 ＜ x1 ＜ X2, f (x1) ＜ f (x2) = > [f (x1) - f (x2)] / (x1-x2) ＞ 0, thus [f (x1) - f (x2)] / (x1-x2) ＞ 0 becomes

How to judge the direction of vector product by right-handed screw rule

A school organizes students' spring outing. If it rents several 45 seat buses, there are 15 people without seats. If it rents the same number of 60 seat buses, there will be one more, and the rest of the buses are just full. It is known that the daily rent of 45 seat buses is 250 yuan for each bus, and the daily rent of 60 seat buses is 300 yuan. Which bus is more cost-effective and how many cars?

Let's rent x buses with 45 seats. According to the meaning of the question, we get: 45x + 15 = 60 (x-1), and the solution is: x = 5, so the rent of 45 seats should be 250 × (5 + 1) = 1500 (yuan), and the rent of 60 seats should be 300 × (5-1) = 1200 (yuan), so it's more cost-effective to rent 4 buses with 60 seats

Why is the limit of LIM 3x / X - √ x2-3 3 3 / 2 when x tends to negative infinity

lim 3x/X-√ x2-3
=Lim3x / X - (- x) √ (1-3 / x ^ 2)) because XX tends to be negative infinity, so when x puts forward the root sign, it is a positive number, so it is - X
=lim3x/x(1+√(1-3/x^2))
=lim3/(1+√(1-3/x^2))
=3/(1+1)
=3/2

Sequence problem A1 = 1, an + 1 = Sn + 3 ^ n (the nth power of 3), find Sn, an
RT, process ~ ~ thank you~~

s(1)=a(1)=1,
s(n+1)-s(n)=a(n+1)=s(n)+3^n,
s(n+1)=2s(n)+3^n=2s(n)+3^(n+1)-2*3^n,
s(n+1)-3^(n+1)=2[s(n)-3^n],
The {s (n) - 3 ^ n} is an equal ratio sequence whose first term is s (1) - 3 ^ 1 = 1-3 = - 2 and the common ratio is 2
s(n)-3^n=(-2)*2^(n-1)=-2^n,
s(n)=3^n-2^n,n=1,2,...
a(n+1)=s(n)+3^n=2*3^n-2^n=2*3^(n+1-1)-2^(n+1-1),
a(n)=2*3^(n-1)-2^(n-1),n=1,2,...

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The area of Tiananmen Square is about 440000 square meters. Please estimate that one millionth of it is equivalent to ()
A. Area of classroom floor B. area of blackboard C. area of desk D. area of pencil box

440000 square meters = 440000 square meters, 440000 × 11000000 = 0.44 square meters, less than half a square meter, should be the area of the desk

How to solve the problem of (3a squared-b squared-2ab) + (B squared-ab-2a squared)