125把x3 x-y-y3分解因式.doc

+x-y-y3分解因式,结果为[    ]
A.(x-y)(x2-xy+y2+1);
B.(x-y)(x2-xy+y2-1);
C.(x-y)(x2+xy+y2+1);
.
-x2+2x3-x4,正确的是[    ]
A.(x-2)(x+1)(x2-x+2);           B.(x+2)(x-1)(x2-x+2);
C.-(x-2)(x+1)(x2+x+2);         D.-(x-2)(x+1)(x2-x+2).
-4x2-y2-k有一个因式为(1-2x+y),则k的值为[    ]
;                                    ;
C.-1;                                   .
+64,正确的是[    ]
A.(x2+8)(x2-8);                     B.(x2+8)(x2+8);
C.(x2+4x+8)(x2-4x+8);          .
[    ]
-bc+ac-ab=(a-b)(a+c);
-5a+3b-15=(b-5)(a+3);
-6xy-1+9y2=(x+3y+1)(x+3y-1);
+3xy-2x-6y=(x+3y)(x-2).
130.-(3x-1)(x+2y)是下列哪个多项式的分解结果[    ]
+6xy-x-2y;                   -6xy+x-2y;
+2y+3x2+6xy;                 +2y-3x2-6xy.

x3-x2-x+1,                   x2+y-xy-x,
x2-2x-y2+1,                 (x2+3x)2-(2x+2)2
中,不含有(x-1)因式的有[    ]
;                                ;
;                                .
-4b2y-3b2x+4a2y,正确的是[    ]
A.-(a2+b2)(3x+4y);                B.(a-b)(a+b)(3x+4y);
C.(a2+b2)(3x-4y);                  D.(a-b)(a+b)(3x-4y).
+4ab+2b2-8c2,正确的是[    ]
(a+b-2c);                        (a+b+c)(a+b-c);
C.(2a+b+4c)(2a+b-4c);         (a+b+2c)(a+b-2c).
(x2-6)2-6(x2-6)+9分解因式为[    ]
A.(x+3)(x-3);                       -9;
C.(x+3)2(x-3)2;