If the difference between two numbers is 3, if the larger number is x, find the functional expression of their product y and X, and find the maximum value

If the difference between two numbers is 3, if the larger number is x, find the functional expression of their product y and X, and find the maximum value

1. If the two numbers are: X, x-3, then
y=x（x-3）；
There is a minimum value;
y=x（x-3）=（x-3/2）^2-9/4
When x = 3 / 2, y = - 9 / 4

2. Y is a linear function of X, when x = 2, y = 6, when x = 0, y = - 3, find the functional expression of Y and X

Y = 4.5x-3 brother, are you a junior high school student? Use the general linear function expression of y = KX + n to bring in when x = 2, y = 6, when x = 0, y = - 3. That is, 6 = 2 * k + n - 3 = 0 * k + n to get k = 4.5 n = - 3. Study hard. You still don't understand what a linear function is. Go back and review it. I go to work and go home to play Warcraft at night

1. Suppose a = b = C = 2, the result of finding the expression a + + + B + + + C + + is_______ (3 points) a, B, C, D, a, 6 B, 9 C, 8 D, expression

(a++)+(b++)+(c++)
=(2)+(2)+(2)
=6
A + + evaluates the expression first and then a = a + 1, so a + + in the expression is 2 and then a is 3

2. If there are the following statements: int a [12] = {1,2,3,4,5,6,7,8}; char c ='a ', D, G; then the expression of 4 is (d). A.A [G-C] B
2. If there are the following statements: int a [12] = {1,2,3,4,5,6,7,8}; char c ='a ', D, G; then the expression of 4 is (d)
A.a[g-c] B.a[4]
C.a['d'- 'c'] D.a['d'-c]

The value of variable C is' a '
So C -'d '='a' -'d '= = 3
So a ['d '- C] = = a [3] = = 4