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(x+4y)(x﹣4y) (x+2y)(x﹣2y) (x﹣4y)2 (x﹣2y)2
3x+4y-36=0 3x-2y-18=0 2x-2y-24=0 2x-4y-36=0
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
9x224xy+16y2 9x2+12xy+16y2 9x216y2 9x2+24xy+16y2
y(x+2)(x﹣2) y(x+4)(x﹣4) y(x2﹣4) y(x﹣2)2
y(x+2)(x﹣2) y(x+4)(x﹣4) y(x2﹣4) y(x﹣2)2
)2x(3x-2)=5x2-4x ( )(2y +3x)(3x-2y)=9x2-4y2 ( )(x+2) 2=x2+2x+4 ( )(x+2)(2x-1)=2x2+5x-2
3x2+2x2=5x 4 (-x2)3=-x 6 (2x2y)2=2x4y2 (x+y2)2=x2+y4
3x2y•5xy2=-2x2y -2x2y3•2xy=-2x3y4 28x4y2÷7x3y=4xy (-3a-2)(3a+2)=9a2-4
(4x-3y)(-3y-4x) (2x2-y2)(2x2+y2) (a+b-c)(-c-b+a) (-x+y)(x-y)
x2+y2+4x﹣2y﹣4=0 x2+y2﹣4x+2y﹣4=0 x2+y2﹣4x+2y+4=0 x2+y2+4x+2y﹣6=0
x4+x4=2x8 x3•x2=x6 (x2y)3=x6y3 (x﹣y)(y﹣x)=x2﹣y2
(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