因式分解:x2-9a2+12a-4;x2y+3xy2-x-3y;1-x2-2xy-y2;3a2+2b-2ab-3a;x2+y2+2xy+ax+ay;3x4-48y48a3-4a2-2a+1;x2-3xy-28y2;(x2-x)^2-4(x2-x)-12

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因式分解:x2-9a2+12a-4;x2y+3xy2-x-3y;1-x2-2xy-y2;3a2+2b-2ab-3a;x2+y2+2xy+ax+ay;3x4-48y48a3-4a2-2a+1;x2-3xy-28y2;(x2-x)^2-4(x2-x)-12

因式分解:x2-9a2+12a-4;x2y+3xy2-x-3y;1-x2-2xy-y2;3a2+2b-2ab-3a;x2+y2+2xy+ax+ay;3x4-48y48a3-4a2-2a+1;x2-3xy-28y2;(x2-x)^2-4(x2-x)-12
因式分解:x2-9a2+12a-4;x2y+3xy2-x-3y;1-x2-2xy-y2;3a2+2b-2ab-3a;x2+y2+2xy+ax+ay;3x4-48y4
8a3-4a2-2a+1;x2-3xy-28y2;(x2-x)^2-4(x2-x)-12

因式分解:x2-9a2+12a-4;x2y+3xy2-x-3y;1-x2-2xy-y2;3a2+2b-2ab-3a;x2+y2+2xy+ax+ay;3x4-48y48a3-4a2-2a+1;x2-3xy-28y2;(x2-x)^2-4(x2-x)-12
x2-9a2+12a-4=x2-[(3a)2-2*3a*2+4]=x2-(3a-2)^2=(x+3a-2)(x-3a+2)
x2y+3xy2-x-3y=xy(x+3y)-(x+3y)=(xy-1)(x+3y)
1-x2-2xy-y2=1-(x+y)^2=(1+x+y)(1-x-y)
3a2+2b-2ab-3a=3a(a-1)-2b(a-1)=(3a-2b)(a-1)
x2+y2+2xy+ax+ay=(x+y)^2+a(x+y)=(x+y)(x+y+a)
3x4-48y4=3(x^4-16y^4)=3(x^2+4y^2)(x+2y)(x-2y)

x2,x2,y2是啥意思啊,平方吗