It is known that the absolute value of the square of (x + 2) + Y-3 is equal to O. find the value of 5 (2x-y) - 16 (3x + y + 1) - 4 (4x + 3y-2)

It is known that the absolute value of the square of (x + 2) + Y-3 is equal to O. find the value of 5 (2x-y) - 16 (3x + y + 1) - 4 (4x + 3y-2)

The absolute value of the square of (x + 2) + Y-3 is O, x = - 2, y = 3

Given that the function y = (a-square-1) x-square-2x + 3 is an increasing function in the interval {1, + ∞}, the value range of real number a is obtained

When a ^ 2-1 = 0, y = - 2x + 3, it is inconsistent
When a ^ 2-10, the axis of symmetry x = 1 / (a ^ 2-1) needs to be on the left side of the interval, (1, + ∞), so 1 / (a ^ 2-1) a > √ 2 or a √ 2 or a

Find the instantaneous change rate of function y = 3x ^ 2-4x + 2 at x = 3

From y = 3x & # 178; - 4x + 2
Derivation of Y: y '= 6x-4
Substituting x = 3 into y '= 14 is the instantaneous change rate of y = 3x ^ 2-4x + 2 at x = 3

How to do 4 (3x-15) + 30-2x = 120

4(3x-15)+30-2x=120
12x-60+30-2x=120
12x-2x=120+60-30
10x=150
x=15

3x+15=2x-2

3x+15=2x-2
3x-2x=-15-2
x=-17
I'm glad to answer for you. I wish you progress in your study! If you don't understand, you can ask!
If you agree with my answer, please click the [select as satisfactory answer] button below, thank you!

Fill a number in the two squares of equation 3 × □ - 2 × □ = 15 so that the two numbers are opposite to each other and the equation holds, then the number in the first square is______ ．

Let the number in the first square be x, and the number in the second square be - X. according to the meaning of the question, we get 3x + 2x = 15, and the solution is x = 3. Then the number in the first square is 3. So the answer is: 3

It is known that 3-2 · (A-2) > 2a-1
I've worked it out

a0
|4-2a|=4-2a
So the original formula = (- A + 2) - (4-2a)
=-a+2-4+2a
=a-2

In May 2008, the Bei family bought a house with a total price of 500000 yuan and a down payment of 60%. The rest was paid in two years. One year later, they paid 20% of the total price and 6% of the annual interest. Two years later, they paid 20% of the total price and 6% of the annual interest?
Wrong, wrong, resend it!
Lili's family bought a house in May 2008, with a total price of 500000 yuan and a down payment of 60%. The rest will be paid in two years, 20% of the total price and 5% of the annual interest after one year, 20% of the total price and 6% of the annual interest after two years. Please calculate how many million yuan Lili's family has paid when the house is paid off?

The down payment is 300000, 100000 + 10000 interest will be paid after one year, and 100000 + 6000 interest will be paid in the second year
516000 in total

1. The sixth grade students of Yuying school travel to the countryside on foot. The students of class 6.1 form the front team with a walking speed of 4 km / h, and the students of class 6.2 form the back team with a walking speed of 6 km / h. the front team starts one hour later, and the back team starts. At the same time, a liaison person is sent to ride a bicycle to keep in touch between the two teams. His cycling speed is 12 km / h
(1) How long does it take for the back team to catch up with the front team?
(2) How far is it from the back team when the liaison starts to catch up with the front team?

1.
It took x hours for the former team to catch up with the latter
4（X+1）=6X
The solution is: x = 2
2*12=24（km）
That is: when the back team catches up with the front team, the liaison rode 24km
two
It takes x hours for a liaison to catch up with the front team after departure
12X=4×1+4X
8X=4
X=0.5
0.5 × 12 = 6 km
0.5 × 6 = 3 km
6-3 = 3km
When the liaison starts to catch up with the front team, it is 3km away from the rear team

How to solve the ratio of 4 / 3 to x = 10 to 5 / 12?

10x = 4 / 3 times 5 / 12 10x = 5 / 9 x = 5 / 9 divided by 10x = 1 / 18