Question

2X的2次方+4X+Y的2次方=2XY-4,求X的Y次方是多少

Answer 1

2x2+4x+y2=2xy-4

2x2-2xy+y2=-4x-4

x2-2xy+y2=-x2-4x-4

(x-y)2=-(x+2)2

则:X=-2,y=-2

(-2)-2=1/4

x,y,()后面的2是2次方