If (X-Y) 2 + M = x2 + XY + Y2, then the value of M is () A. xyB. 0C. 2xyD. 3xy

If (X-Y) 2 + M = x2 + XY + Y2, then the value of M is () A. xyB. 0C. 2xyD. 3xy

∵ (X-Y) 2 + M = x2 + XY + Y2, ∵ M = x2 + XY + Y2 - (X-Y) 2 = 3xy

Point m [x, y] if XY equals 0, then point m is________ If XY > 0, then point m is in the_______ If XY

Point m [x, y] if XY is equal to 0, then point m is on the x-axis or y-axis. If XY > 0, then point m is in the first quadrant or the third quadrant if XY

In the plane rectangular coordinate system, the definition: P (x, y), if x + y = - XY, then the point P is called "good point" 1
In the plane rectangular coordinate system, P (x, y) is defined. If x + y = - XY is satisfied, then point P is called "good point"
1. If the good point is on y = 4 / x, find the good point
2. Proof: there must be two good points on y = x + M

[-2,-2]
 

2、 11. Point a (x, y) is a point in the plane rectangular coordinate system, if XY
y

11. In the second or fourth quadrant, on the y-axis
12._ 7_ _ 4_ _ √65_
13. In the function y = KX + B (k > 0), the value of Y decreases with the decrease of X,
Or y = KX + B (k < 0) y increases with the decrease of x value
And the intersection coordinates of function image and x-axis, y-axis
They are | y | and | x |
14 questions incomplete
No.1, row 15 (10,10) 7
16.y=x
17.y=-x-3
18. The solution of the linear equation of one variable 0.5x + 1 = 0 is the abscissa of the intersection of the image of the linear function y = 0.5x + 1 and the x-axis