因式分解x2+y2-x2y2-4xy-1;
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因式分解x2+y2-x2y2-4xy-1;
因式分解x2y2-x2-y2+1
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已知x2+4y2+x2y2+1=6xy,则(x4-y4)/(2x2+xy-y2)*(2x-y)/(xy-y2)/(x2+y2/y)2=
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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
十字相乘法解题1)2x2-5x-12; (2)3x2-5x-2; (3)6x2-13x+5; (4)7x2-19x-6; (5)12x2-13x+3; (6)4x2+24x+27.(1)6x2-13xy+6y2; (2)8x2y2+6xy-35; (3)18x2-21xy+5y2