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x2+6xy+9y2=(x+3y)2 2x2﹣4xy+9y2=(2x﹣3y)2 2x2﹣8y2=2(x+4y)(x﹣4y) x(x﹣y)+y(y﹣x)=(x﹣y)(x+y)
5x﹣2x=3x 5ab﹣5ba=0 4x2y﹣5xy2=﹣x2y 3x2+2x2=5x2
a (x + y) =a x + a y x2-4x+4=x(x-4)+4 10x2-5x=5x(2x-1) x2-16+3x=(x-4)(x+4)+3x
(y﹣x)(x+y) (2x﹣y)(﹣y+2x) (x﹣3y)(x+3y) (4x﹣5y)(5y+4x)
)2x(3x-2)=5x2-4x ( )(2y +3x)(3x-2y)=9x2-4y2 ( )(x+2) 2=x2+2x+4 ( )(x+2)(2x-1)=2x2+5x-2
如果2x=2y+1,那么x=y+1 如果2=5+3x,那么3x=5﹣2 如果x﹣3=y﹣3,那么x=y 如果﹣8x=4,那么x=﹣2
3a+2b=5ab 5y2-3y2=2 2ab-ab=ab 3x2y-5x2y=2x2y
(4x-3y)(-3y-4x) (2x2-y2)(2x2+y2) (a+b-c)(-c-b+a) (-x+y)(x-y)
(y﹣x)(x+y) (2x﹣y)(﹣y﹣2x) (x﹣3y)(﹣3y+x) (4x﹣5y)(5y+4x)
x4+x4=2x8 (x2y)3=x6y (x2)3=x5 -x3·(-x)5=x8
(y﹣1)(y+1)=y2﹣1 x2y+xy2﹣1=xy(x+y)﹣1 (x﹣2)(x﹣3)=(3﹣x)(2﹣x) x2﹣4x+4=(x﹣2)2
x2y﹣2x2y=﹣x2y 2a+3b=5ab 7ab﹣3ab=4 a3+a2=a5
x2y﹣2x2y=﹣x2y 2a+3b=5ab 7ab﹣3ab=4 a3+a2=a5