It is known that the function y = f (x) is odd and f (x) = x-2x + 3 when x > 0

It is known that the function y = f (x) is odd and f (x) = x-2x + 3 when x > 0

F (- x) = - f (x) f (- x) = x + 2x + 3 = - f (x) f (x) = - x-2x-3 (x < 0), please click [adopt the answer], your adoption is the driving force of my answer, thank you

Given that the function y = f (x) is an odd function on R, and when x > 0, f (x) = x ^ 2-2x + 1, then the analytic expression of F (x) is f (x)=

This is a piecewise function; first, when x > 0, f (x) = x ^ 2-2x + 1; then solve X

We know three rational numbers a.b.c. when x = |a | / A + |b | / B + |c | C, we can find the value of 92x + 2 to the power of 2008 of algebra X

Original title:
Known ABC

6-2x + 6x = 18,7x + 3x1.4x = 0.2x56,5 (3-2x) = 2.4x5,

A big shark, head length is 3 meters, head length is equal to body length and tail length, tail length is equal to the sum of head length and body length, what is the total length of this big shark?

Let the body length be x meters, & nbsp; & nbsp; & nbsp; 3 = x + 12 (3 + x) & nbsp; & nbsp; & nbsp; & nbsp; 3 = x + 1.5 + 12x & nbsp; 3-1.5 = 1.5 + 32x-1.51.5 △ 32 = 32x △ 32 & nbsp; & nbsp; & nbsp; & nbsp; X = 1; 12 × (3 + 1) = 12 × 4 = 2 (meters); 3 + 1 + 2 = 6 (meters)

Find the extremum of function f (x) = 13x3 − 4x + 4

∵f(x)＝13x3−4x+4，∴f′（x）=x2-4=（x-2）（x+2）．                           … If f '(x) = 0, the solution is x = 2, or x = - 2 When f '(x) > 0, i.e. x > 2, or x < 2; when f' (x) < 0, i.e. - 2 < x < 2. When x changes, the changes of F '(x), f (x) are as follows: X (- ∞, - 2) - 2 (- 2, 2) 2 (2, + ∞) f' (x) & nbsp; + 0_ 0 + F (x) monotonically increasing 283 & nbsp; monotonically decreasing − 43 & nbsp; monotonically increasing Therefore, when x = - 2, f (x) has a maximum, and the maximum is f (- 2) = 283; when x = 2, f (x) has a minimum, and the minimum is f (2) = -43 12 points

MC, Mr, MS, M +, CE, C on calculator,

MC: clear numbers in independent memory
MR: read independent memory digital
MS: save the display number to independent memory, and replace the original number in memory
M +: add the display number to the independent memory
(independent memory is a memory for temporarily storing numbers, which is convenient for calculation)
CE: clear error key. If there is an error in the input number, press it to re-enter
C: Reset the calculator to the power on state

(R1 + R2) / r1r2, thank you,

It is the total resistance calculation formula of parallel circuit, which is generally used for multiple choice questions and fill in the blanks. The formula r = u / I is OK for calculation questions, unless it only tells you the resistance

The coefficients of binomial (2x − 1x) 6 expansion with x2 term are______ ．

The general term of the expansion of (2x − LX) 6 is tr + 1 = Cr6 (2x) 6 − R (− LX) r = (- 1) r26-rc6rx3-r, let 3-R = 2 get r = 1, so the coefficient of the X2 term in the expansion is T2 = - 25c61 = - 192

Two operations "*" and "&" are defined to calculate the value of 4 * [(6 & 8) & (3 & 5) for integers a, a, a & B = a + B-1, a & B = AB-1

Because a * b = a + B-1, a & B = AB-1,
So 4 * [(6 & 8) & (3 & 5)] can be changed into:
4+{（6x8-1）x（3x5-1）-1}-1
=4+{47x34-1}-1
=4+1597-1
=1600