因式分解综合专项练习76题有答案
因式分解综合专项练习因式分解综合专项练习 7676 题(有答案)题(有答案) (1)9(a+b)2﹣4(a﹣b)2, (2) (x2+y2)2﹣4x2y2, (3)ax2﹣16ay2 (4)﹣2a3+12a2﹣18a (5)x2﹣7x+10 6)a2﹣2ab+b2﹣1 (7)﹣2xy﹣x2﹣y2, 8)16(m﹣n)2﹣9(m+n)2, 9)4x2(x﹣y)+(y﹣x) , 10) (a+1) (a2+2a﹣1)+2(a+1) ( ( ( ( (11)a2(x﹣y)+b2(y﹣x) (12)x2﹣xy+ y2﹣1. (13)﹣3a3+12a (14)a2(x﹣y)﹣4a(y﹣x)+4(x﹣y) (15) (a+2) (a﹣2)+3a (16)x3﹣2x2+x (17)8(x2﹣2y2)﹣x(7x+y)+xy (18)4x2﹣64 (19)4ab2﹣4a2b﹣b3 (20)16(m﹣n)2﹣9(m+n)2 (21)x2(x﹣y)+(y﹣x) (22)6m(m+n)﹣4n(m+n) (23)x4﹣y4 (24)﹣3a2+12ab﹣12b2. (25)4a2﹣1 (26)2x3﹣12x2y+18xy2 (27)x2﹣2xy+y2﹣9 (28)ax2﹣16ay2 (29)a3+ab2﹣2a2b (30)x2y(m﹣n)﹣xy2(n﹣m) (31)a2+2ab+b2﹣9 (32)4x3﹣8x2+4x (33) (x+y+z)2﹣(x﹣y﹣z)2 (34)(x﹣1)2﹣ (35)a2(x﹣y)﹣b2(x﹣y) (36)2x2﹣12x+18 (37)2x3﹣18x (38)x3y﹣x2y2﹣12xy3 (39)2x2﹣8xy+8y2; (40) (x2+y2)2﹣4x2y2. (41) (a﹣b)3﹣2(b﹣a)2 (42)3x3﹣12x2y+12xy2 (43) (3a﹣b) (x﹣y)+(a+3b) (y﹣x) (44)2a2b+4ab﹣2b (45)16x4﹣8x2y2+y4 (46)a3﹣6a2﹣7a (47) (x2+x)2﹣(x+1)2 (48)﹣4x3y2+28x2y﹣2xy (49)a3﹣4ab2 (50) (x2+1)2﹣4x(x2+1)+4x2 (51)x2y2﹣x2﹣4y2+4xy(56)4(x﹣2)2﹣1 (52) (a2+1) (a2+2)+ . (57) (x+y)2+4(x+y+1) (53)a2﹣(b+c)2 (54) (x﹣y) (x2﹣xy+y2)﹣ (55)x2+7x﹣18. xy(x﹣y) (58)2x(x﹣3)﹣8 (59)x2+y2﹣b2﹣2xy (60)3a4bc﹣12a3b2c+12a2b3c, (61)16(a﹣b)2﹣9(a+b)2, (62)3x(a﹣b)﹣6y(b﹣a) (63)a2+2a(b﹣c)+(b﹣c)2 (64)4ab2﹣4a2b﹣b3 (65)x3﹣2x2y+xy2 (66)x2﹣4y2﹣3x+6y (67)x(x﹣y)﹣y(y﹣x) (68)3a2﹣12b2 (69)m2(a﹣1)﹣2m(a﹣1)+(a﹣1) (70) (a﹣b)2+4ab (71)x2(a﹣b)+4(b﹣a) (72)49(m+n)2﹣25(n﹣m)2 (73) (y﹣x)2﹣10 x+10y+25 (74)a(x﹣a) (x+y) 2﹣b(x﹣a)2(x+y) (75)已知: xy=2,x=2y+1.求:x3y﹣ 4x2y2+4xy3的值. (76) 已知 P=2x2+4y+13, Q=x2﹣y2+6x﹣1, 比较代数式 P,Q 的大小. 因式分解综合因式分解综合 7676 题参考答案:题参考答案: (1)9(a+b)2﹣4(a﹣b)2, =[3(a+b)+2(a﹣b)][3(a+b)﹣ ﹣b)], =(5a+b) (a+5b) ; (2) (x2+y2)2﹣4x2y2, =(x2+y2+2xy) (x2+y2﹣2xy) , =(x+y)2(x﹣y)2. (5)ax2﹣16ay2 =a(x2﹣16y2) 2(a (x+4y) (x﹣4y) ; 6)﹣2a3+12a2﹣18a ﹣2a(a2﹣6a+9) ﹣2a(a﹣3)2; 5)x2﹣7x+10=(x-2) (x﹣5) ; 7)a2﹣2ab+b2﹣1 (a﹣b)2﹣1 (a﹣b+1) (a﹣b﹣1) . 7)﹣2xy﹣x2﹣y2, ﹣(2xy+x2+y2) , =a ( = = ( ( = = ( = =﹣(x+y)2; (8)16(m﹣n)2﹣9(m+n)2, =[4 (m﹣n) +3 (m+n) ][4 (m﹣n) ﹣3 (m+n) ], =(7m﹣n) (m﹣7n) ; (9)4x2(x﹣y)+(y﹣x) , =4x2(x﹣y)﹣(x﹣y) , =(x﹣y) (4x2﹣1) , =(x﹣y) (2x+1) (2x﹣1) .(1)x3y ﹣xy3 =xy(x2﹣y2) =xy(x+y) (x﹣y) ; (10) (a+1) (a2+2a﹣1)+2(a+1) =(a+1) (a2+2a+1) =(a+1)3 (11)a2(x﹣y)+b2(y﹣x) =a2(x﹣y)﹣b2(x﹣y) =(x﹣y) (a2﹣b2) =(x﹣y) (a+b) (a﹣b) ; (12)x2﹣xy+ y2﹣1. =(x﹣ y)2﹣1 =(x﹣ y+1) (x﹣ y﹣1) . (13)﹣3a3+12a =﹣3a(a2﹣4) =﹣3a(a+2) (a﹣2) ; (14)a2(x﹣y)﹣4a(y﹣x)+4(x﹣y) =(x﹣y) (a2+4a+4) =(x﹣y) (a+2)2. (15) (a+2) (a﹣2)+3a =a2+3a﹣4 =(a+4) (a﹣1) (16)x3﹣2x2+x =x(x2﹣2x+1) =x(x﹣1)2; (17)8(x2﹣2y2)﹣x(7x+y)+xy =8x2﹣16y2﹣7x2﹣xy+xy =x2﹣16y2 =(x+4y) (x﹣4y) . (18)4x2﹣64 =4(x2﹣16) =4(x+4) (x﹣4) ; (19)4ab2﹣4a2b﹣b3 =﹣b(4a2﹣4ab+b2) =﹣b(2a﹣b)2; (20)16(m﹣n)2﹣9(m+n)2 =[4 (m﹣n) +3 (m+n) ][4 (m﹣n) ﹣3 (m+n) ] =(7m﹣n) (m﹣7n) ; (22)x2(x﹣y)+(y﹣x) =(x﹣y) (x+1) (x﹣1) . (22)6m(m+n)﹣4n(m+n) =2(m+n) (3m﹣2n) ; (23)x4﹣y4 =(x2+y2) (x2﹣y2) =(x2+y2) (x+y) (x﹣y) ; (24)﹣3a2+12ab﹣12b2. =﹣3(a2﹣4ab+4b2) =﹣3(a﹣2b)2 (25)4a2﹣1 =(2a+1) (2a﹣1) ; (26)2x3﹣12x2y+18xy2 =2x(x2﹣6xy+9y2) =2x(x﹣3y)2; (28)x2﹣2xy+y2﹣9 =(x﹣y)2﹣32 =(x﹣y+3) (x﹣y﹣3) . (28)ax2﹣16ay2 =a(x2﹣16y2) =2(x+4y) (x﹣4y) ;