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-4x2-5y -4x2+5y (4x2-5y)2 (4x+5y)2
3x+4y+5=0 3x+4y-5=0 -3x+4y-5=0 -3x+4y+5=0
x﹣4y+3=0 x﹣4y﹣5=0 4x+y+5=0 4x+y﹣5=0
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
(y﹣x)(x+y) (2x﹣y)(﹣y+2x) (x﹣3y)(x+3y) (4x﹣5y)(5y+4x)
3x+4y+5=0 3x+4y-5=0 -3x+4y-5=0 -3x+4y+5=0
3x+4y﹣5=0 3x+4y+5=0 3x﹣4y+5=0 3x﹣4y﹣5=0
x=4,y=4,a=1 x=5,y=5,a=1 x=5,y=4,a=3 x=5,y=,a=1
3x+4y﹣5=0 3x+4y+5=0 3x﹣4y+5=0 3x﹣4y﹣5=0
x=4,y=4,a=1 x=5,y=5,a=1 x=5,y=4,a=3 x=5,y=4,a=1
x=4,y=4,a=1 x=5,y=5,a=1 x=5,y=4,a=3 x=5,y=4,a=1
x=4,y=4,a=1 x=5,y=5,a=1 x=5,y=4,a=3 x=5,y=4,a=1
x=4,y=4,a=1 x=5,y=5,a=1 x=5,y=4,a=3 x=5,y=4,a=1
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A) x=4,y=4,a=1 x=5,y=5,a=1 x=5,y=4,a=3 x=5,y=4,a=1
(x-5y+1)(x-5y-8) (x-5y+4)(x-5y-2) (x-5y-4)(x-5y-2) (x-5y-4)(x-5y+2)
(y﹣x)(x+y) (2x﹣y)(﹣y﹣2x) (x﹣3y)(﹣3y+x) (4x﹣5y)(5y+4x)
(x+1)(x+4)=x2+5x+4 (y+4)(y-5)=y2+9y-20 (m+2)(m-3)=m2-m-6 (x-3)(x-6)=x2-9x+18
x=4,y=4,a=1 x=5,y=5,a=1 x=5,y=4,a=3 x=5,y=4,a=1