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a2-4ab+4b2=(a-2b)2 ax+ay+a=a(x+y)+a
a2+b2=(a+b)2 a2﹣2ab+b2=(a﹣b)2 x2+x3=x3(+1) x(y+z+1)=xy+xz+x
a+2a2=3a3 (a+b)2=a2+ab+b2 2(a﹣b)=2a﹣2b (2ab)2÷(ab)=2ab(ab≠0)
(a+3)(a﹣3)=a2﹣9 x2+x﹣5=(x﹣2)(x+3)+1 a2b+ab2=ab(a+b) x2+1=x(x+)
(a+1)(a﹣1)=a2﹣1 (x﹣y)(m﹣n)=(y﹣x)(n﹣m) ab﹣a﹣b+1=(a﹣1)(b﹣1) m2﹣2m﹣3=m(m﹣2)﹣3
x2﹣x=x(x﹣1) a(a﹣b)=a2﹣ab (a+3)(a﹣3)=a2﹣9 x2﹣2x+1=x(x﹣2)+1
a2-4ab+4b2=(a-2b)2 ax+ay+a=a(x+y)
﹣x﹣y=﹣(x﹣y) ﹣a+b=﹣(a+b) (y﹣x)2=(x﹣y)2 (a﹣b)3=(b﹣a)3
x2﹣9+6x=(x+3)(x﹣3)+6x (x+5)(x﹣2)=x2+3x﹣10 x2﹣8x+16=(x﹣4)2 6ab=2a•3b
(a+3)(a-3)=a2-9; a3+b3=(a+b)(a2-ab+b2) a2-4a-5=(a-2)2-9; a2-4a-5=a(a-4)-5
a2+2ab-b2 a2b-2ab+ab=2 4(a+b)2-20(a+b)2+25 -2a2+4ab+2b2
3a+2b=5ab 5y2-3y2=2 2ab-ab=ab 3x2y-5x2y=2x2y
x2-6x+9=(x-3)2 (x+3)(x-1)=x2+2x-3 x2-9+6x=(x+3)(x-3)+6x 6ab=2a·3b
x2-x=x(x-1) a(a-b)=a2-ab (a+3)(a-3)=a2-9 x2-2x+1=x(x-2)+1