因式分解综合专项练习含答案

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因式分解综合专项练习(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

(52)(a2+1)(a2+2)+.

(53)a2﹣(b+c)2

(54)(x﹣y)(x2﹣xy+y2)﹣xy(x﹣y)(55)x2+7x﹣18.

(56)4(x﹣2)2﹣1

(57)(x+y)2+4(x+y+1)(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)2﹣10x+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76题参考答案:

(1)9(a+b)2﹣4(a﹣b)2,

=[3(a+b)+2(a﹣b)][3(a+b)﹣2(a﹣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)

=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),

=﹣(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).

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