If the intersection of the line y = K1X + B1 and the line y = k2x + B2 is on the x-axis, then a K1 = K2, B B1 = B2, C k1b2 = K2, D K1 + B1 = K2 + B2

If the intersection of the line y = K1X + B1 and the line y = k2x + B2 is on the x-axis, then a K1 = K2, B B1 = B2, C k1b2 = K2, D K1 + B1 = K2 + B2

X-axis then y = 0
That is, when y = 0, two X are equal
So - B1 / K1 = - B2 / K2
So b1k2 = b2k1
Choose C

On the square (1, - 1) of parabola C: y = ax, passing through point P, sit two straight lines with slopes K1 and K2. The intersecting parabola is different from two points a and B of P, and K1 + K2 = 0
Is the slope of line AB a constant?

The tangent slope of C is y '= 2aX
Let a be (x1, Y1), B be (X2, Y2)
The slope of line AP is (Y1 + 1) / (x1-1) = 2ax1
ax1^2+1=y1+1=2ax1(x1-1)
ax1^2-2ax1-1=0.
In the same way
ax2^2-2ax2-1=0.
So X1 + x2 = 2A, x1x2 = - 1
The slope of AB is
(y1-y1)/(x1-x2)=(ax1^2-ax2^2)/(x1-x2)=
a(x1-x2)(x1+x2)/(x1-x2)=a(x1+x2)=2a^2.
So the slope of AB is constant

If x is defined as a double variable, the statements that can correctly input x value are. A) scanf (% F ", x); b) scanf (% F", & x); c) scanf（
D）scanf(“%5.1f”,&x);

If you have the option of LF, you can choose it

Set the variable definition as "int, a, B;", and execute scanf ("a = D, B = D", & A, & B); when the statement is executed, enter_____ Then the values of a and B are both 10
A、10 10 B、10,10 C、a=10 b=10 D、a=10,b=10

D、a=10, b=10
All commas must match