How to calculate the equation 4 (x + 1.5) = 16

How to calculate the equation 4 (x + 1.5) = 16

4(x+1.5)=16
4x+6=16
4x=10
x=2.5

8-x=16.

x=8-16.3=-8.3

If 1 + 2 = 13,2 + 3 = 25,3 + 4 = 41, what is 4 + 5

=(1+50)*50/2%D%A=1275

The scenery in my eyes
emergency

In the title, you should hold "I", "eyes" and "scenery" (=_ =How do you think it's rubbish.) materials can be written as follows: migrant workers on the road work hard for their families. The aunt of traffic warden selflessly pays for the small plants planted at home for the people As long as it is the kind of usually do not pay attention to the structure of the article

Lesson 22 of PEP

In the autumn of 1941, the Japanese aggressors concentrated their forces to invade the Shanxi Chahar Hebei base. At that time, the seventh company was ordered to persist in guerrilla warfare in the area of Langya Mountain. After more than a month of heroic fighting, the seventh company decided to move to the Dragon King Temple and gave the task of protecting the masses and the company to the sixth class

Let the root of the equation log2 (x) + + x = 5 be x0. If x0 ∈ (k-1 / 2, K + 1 / 2), then the integer K=________ .

F (x) = log2 (x) + X is an increasing function
So you can enumerate
When x = 1,2,3
When x = 3, f (x) 5
So x ∈ (3,3.5)
k=3

Simple calculation of 8.6 * 0.99

8.6*0.99
=8.6*(1-0.01)
=8.6-0.086
=8.514

Within the root sign (24 times 27)

√（24 × 27）
= √（3 × 8 × 3 × 9）
= √（3 ² × 3 ² × 2 ² × 2）
= 3 × 3 × 2√2
= 9 × 2√2
= 18√2

For a commodity, first increase the price by 10%, then decrease the price by 10%, and compare the current price with the original price? For a commodity, first decrease the price by 1 / 10, then increase the price by 1 / 10, and compare the current price with the original price?

Take 100 yuan as an example,
1. After raising the price, 110 yuan, after reducing the price, 110 times 90% = 99 yuan, 99 to 100
2. 90 yuan after price reduction, 90 times 110% after price increase = 99 yuan, 99 to 100

Function y = (1 / 2) ∧ √ - x2 + X + 2 the domain of definition is and the range of value is
Why?

No less than 0 in root sign
∴-x²+x+2≥0
x²-x-2≤0
(x-2)(x+1)≤0
-1≤x≤2
The domain is {x | - 1 ≤ x ≤ 2}
because
The root sign and square are constant ≥ 0
The value range is (0,1]