a. The position of B and C on the number axis is shown in the figure, and a = C, simplify a - B + A + B-C + C + C + C + a=______ .

a. The position of B and C on the number axis is shown in the figure, and a = C, simplify a - B + A + B-C + C + C + C + a=______ .

According to the meaning of the question: B < a < 0 < C, we can get B + a < 0, B-C < 0, C + a > 0, then the original formula = - A + B + A + C-B + C + C + a = a + 3C
The corresponding positions of numbers a, B and C on the number axis are shown in the figure, which is simplified as | a + B | + | B + C | - | C-A |
As can be seen from the figure: a < B < 0 < C, then | a + B | + | B + C | - | C-A | = - A-B + B + C-C + a = 0
Given the position of a, B, C on the number axis as shown in the figure, try to compare the size of numbers a, - A, B, - B, C, - C, 0
---a-------b---0---c--→
-a
Solve the following inequalities and express their solution set on the number axis: ① X-1 ＞ 6 (x + 3); ② x − 22 - (x-1) ＜ 2
(1) On the number axis, it is expressed as follows: (2) to get the denominator, x-2-2 (x-1) < 4, to get the bracket, x-2-2x + 2 < 4, to get the term, x-2x < 4, to get the coefficient into 1, - x < 4, to get the coefficient into 1, x > - 4
The function f (x) = LNX + 1-A / X is known as X1 > 0, X2 > 0, and X1 + x2x1 * X2 is proved by means inequality
From the above, we can see that f (x) = LNX / x increases monotonically on (0, e); {ln (x1 + x2) / (x 1 + x 2) > LNX / x 1, that is, x 1 ln (x 1 + x 2) / (x 1 + x 2) > LNX 1 ①. Similarly, x 2 ln (x 1 + x 2) / (x 1 + x 2) > LNX 2 ② is added to get ln
twenty million twelve thousand and one
————=
twenty million thirty-two thousand and three
That's 20022002 / 20032003
Equal to 2001 / 2003
Approximately equal to 0.999001497
['I calculated it with a computer ']
zero point nine nine nine zero zero one
what do you mean
20012001=2001*10001
20032003=2003*10001
About 10001 points
The score is reduced to 2001 / 2003
It is known that the function f (x) defined on the interval (0, + ∞) satisfies f (x1x2) = f (x1) - f (x2), and when x > 1, f (x) < 0. ① find the value of F (1); ② judge the monotonicity of f (x); ③ if f (3) = - 1, solve the inequality f (| x |) < 2
Solution: ① Let f (x1x2) = f (x1) - f (x2), let X1 = X2, then f (1) = 0; ② let X1 > x2 > 0, then f (x1) - f (x2) = f (x1x2), because x1x2 > 1, so f (x1x2) < 0, so f (x1) - f (x2) < 0, that is, f (x1) < f (x2), so f (x) is in (0, + ∞
Several 412080 and 322337 respectively add up to close to 5415632 but not more than 100 points if they are right
The answer is found. In all possible combinations, ten 412080 and four 322337 are added, that is, 10 * 412080 + 4 * 322337 = 5410148
Closest to 5415632 and not more than
7
10 412080 and 4 322337: 5410148 close to 5415632 but not more than
Request to use arithmetic, and with analysis, thank you! Thank you very much. This problem is to use the equation to deduce 5 * (12 + x) = 41 + 37 + X + x 60 + 5x = 78 + 2x 78-60 = 5x
This topic is 412080x + 322337y
It is known that the function f (x) defined on the interval (0, + ∞) satisfies f (x1x2) = f (x1) - f (x2), and when x > 1, f (x) < 0. ① find the value of F (1); ② judge the monotonicity of f (x); ③ if f (3) = - 1, solve the inequality f (| x |) < 2
Solution: ① Let f (x1x2) = f (x1) - f (x2), let X1 = X2, then f (1) = 0; ② let X1 > x2 > 0, then f (x1) - f (x2) = f (x1x2), because x1x2 > 1, so f (x1x2) < 0, so f (x1) - f (x2) < 0, that is, f (x1) < f (x2), so f (x) is in (0, + ∞
There are 9800 yuan divided by 5 people, 2 people by 40%, 2 people by 30%, 1 person by 20%. How much can each person share?
It's 40% for two, 30% for two and 20% for one instead of 40% for two
9800/(40%*2+30%*2+20%)
=612.5
612.5*4=2450
612.5*3=1837.5
612.5*2=1225
Then 40% of them will be given 2450 yuan each,
30% two people each score 1837.5 yuan
20% points 1225 yuan