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x=3,y=-1 (3,-1) {3,-1} {(3,-1)}
x=3,y=﹣1 (3,﹣1) {3,﹣1} {(3,﹣1)}
{3,–1} 3,–1 (3,–1) {(3,–1)}
x=3,y=﹣1 (3,﹣1) {3,﹣1} {(3,﹣1)}
(0,3] [﹣4,3] [﹣4,0) [﹣4,0]
x=3,y=-1 (3,-1) {(3,-1)} {3,-1}
π 2π
X=4 Y=6 X=2 Y=3 X=1 Y=2 X=3 Y=2
{(﹣1,1),(1,1)} {1} [0,1]
{3,-1} (3,-1) {(3,-1)} {x=3,y=-1}
x2﹣4=(x+4)(x﹣4) x2+2x+1=x(x+2)+1 3mx﹣6my=3m(x﹣6y) 2x+4=2(x+2)