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Who can give me a few one variable equation problems It is difficult and not practical
(8X-50)/3=(10X+40)/5-10
How to make linear equation with one variable
In order to keep the total amount of sales unchanged, how many percent of the sales volume should be increased compared with the original price?
There can only be one unknown number to list the equation of one variable
Suppose that the original sales volume Q, the original unit price P, the percentage of the original sales volume to be increased is x, then
According to the constant sales amount, the following equation can be obtained:
P（1-10%）*Q（1+x）=P*Q
The reality is:
0.9*（+x）=1
x=1/0.9 -1≈11.11%
It is known that the maximum value of quadratic function f (x) = (LGA) x + 2x + 4lga is 3
Since f (x) has a maximum, LGA
A proof of function
Let the definition field of function y = f (x) be r. when x > 0, f (x) > 1, and for any real number a, B ∈ R, f (a + b) = f (a) f (b) holds
1. Prove that f (x) is always positive
2. Prove that f (x) is an increasing function
(1) Let x + b > 0, x0;
It is easy to get f (x + b) > 0 and f (b) > 0
Because f (x + b) = f (x) f (b);
So f (x) > 0
That is, for x0;
What's in the comprehensive question
For X in R, f (x) > 0;
(2) Let a > b, a = B + X; (a, B belong to R)
Easy to get x > 0;
So f (x) > 1;
And f (a) = f (B + x) = f (b) f (x)
Easy to get f (a) > F (b);
That is, f (x) is an increasing function
Given the function y = (2m + 1) x + M-3 (1), if the intercept of the function image on the Y axis is - 2, find the value of M; if the function image is parallel to the straight line y = 3x-3, find the value of M
If the intercept of function image on Y axis is - 2, then M-3 = - 2, M = 1
If the image of the function is parallel to the straight line y = 3x-3, then 2m + 1 = 3, M = 1
How many degrees, how many minutes and how many seconds does 38:15 degree equal to?
∵1°=60′,
∴38.15°=38°+（0.15×60）′=38°9′,
38°9′
If the solution set of inequality (2a-b) x + a-5b > 0 about X is the solution set of XB
(2a-b)x+a-5b>0
(2a-b)x>5b-a
The solution set of ∵ inequality is X
If the area of the triangle formed by the image of the linear function y = - 2x + B and the two coordinate axes is 9, then the value of B is
If the area of the triangle formed by the image of the first-order function y = - 2x + B and the two coordinate axes is 9, then the value of B is ± 6
It is known that the symmetry axis equation of quadratic function image is x + 3 = 0, the image passes through (1, - 6) and the intersection point with y axis is (0, - 5 / 2)
It is known that the equation of symmetry axis of quadratic function image is x + 3 = 0, the image passes through (1, - 6) and the intersection point with y axis is (0, - 5 / 2). Find the analytic formula of this quadratic function
〔2〕 When what is the value of X, the function of this function is 0? [3] when x changes in what range, the function value y of this function increases with the increase of X?
The axis of symmetry is x = - 3
It can be set as y = a (x + 3) ^ 2 + C
y(0)=9a+c=-5/2
y(1)=16a+c=-6
Subtraction: 7a = - 6 + 5 / 2 = - 7 / 2
So a = - 1 / 2
c=-5/2-9a=-5/2+9/2=2
So y = - (x + 3) ^ 2 + 2 = - x ^ 2-6x-7,
Idioms used to describe animals with a lot of hair
I know only one
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