因式分解综合专项练习76题(共11页).doc
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1、精选优质文档-倾情为你奉上 因式分解综合专项练习76题(有答案)专心-专注-专业(1)9(a+b)24(ab)2, (2)(x2+y2)24x2y2,(3) ax216ay2(4) 2a3+12a218a(5)x27x+10(6) a22ab+b21 (7)2xyx2y2,(8)16(mn)29(m+n)2,(9)4x2(xy)+(yx),(10)(a+1)(a2+2a1)+2(a+1) (11)a2(xy)+b2(yx) (12)x2xy+y21(13)3a3+12a(14)a2(xy)4a(yx)+4(xy) (15)(a+2)(a2)+3a (16)x32x2+x(17)8(x22y2)
2、x(7x+y)+xy(18)4x264(19)4ab24a2bb3(20)16(mn)29(m+n)2(21) x2(xy)+(yx)(22)6m(m+n)4n(m+n)(23)x4y4(24)3a2+12ab12b2(25)4a21(26)2x312x2y+18xy2 (27) x22xy+y29(28)ax216ay2(29)a3+ab22a2b(30) x2y(mn)xy2(nm)(31)a2+2ab+b29(32)4x38x2+4x(33)(x+y+z)2(xyz)2(34) (x1)2(35) a2(xy)b2(xy)(36)2x212x+18(37)2x318x(38)x3yx2y
3、212xy3(39)2x28xy+8y2; (40)(x2+y2)24x2y2(41)(ab)32(ba)2(42)3x312x2y+12xy2(43)(3ab)(xy)+(a+3b)(yx) (44)2a2b+4ab2b(45)16x48x2y2+y4(46) a36a27a (47)(x2+x)2(x+1)2(48) 4x3y2+28x2y2xy(49)a34ab2(50)(x2+1)24x(x2+1)+4x2(51)x2y2x24y2+4xy(52)(a2+1)(a2+2)+(53)a2(b+c)2(54)(xy)(x2xy+y2)xy(xy)(55)x2+7x18(56)4(x2)21
4、(57)(x+y)2+4(x+y+1)(58)2x(x3)8(59)x2+y2b22xy(60)3a4bc12a3b2c+12a2b3c,(61)16(ab)29(a+b)2,(62)3x(ab)6y(ba)(63)a2+2a(bc)+(bc)2(64)4ab24a2bb3(65)x32x2y+xy2(66)x24y23x+6y(67)x(xy)y(yx)(68)3a212b2(69)m2(a1)2m(a1)+(a1)(70)(ab)2+4ab(71)x2(ab)+4(ba)(72)49(m+n)225(nm)2(73)(yx)210x+10y+25(74) a(xa)(x+y)2b(xa)2
5、(x+y)(75)已知:xy=2,x=2y+1求:x3y4x2y2+4xy3的值(76)已知P=2x2+4y+13,Q=x2y2+6x1,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)24(ab)2, =3(a+b)+2(ab)3(a+b)2(ab), =(5a+b)(a+5b); (2)(x2+y2)24x2y2, =(x2+y2+2xy)(x2+y22xy), =(x+y)2(xy)2(5) ax216ay2 =a(x216y2) =a(x+4y)(x4y);(6) 2a3+12a218a =2a(a26a+9) =2a(a3)2;(5)x27x+10=(x-2)(x
6、5);(7) a22ab+b21 =(ab)21 =(ab+1)(ab1)(7)2xyx2y2, =(2xy+x2+y2), =(x+y)2;(8)16(mn)29(m+n)2,=4(mn)+3(m+n)4(mn)3(m+n),=(7mn)(m7n);(9)4x2(xy)+(yx),=4x2(xy)(xy),=(xy)(4x21),=(xy)(2x+1)(2x1)(1)x3yxy3=xy(x2y2)=xy(x+y)(xy);(10)(a+1)(a2+2a1)+2(a+1)=(a+1)(a2+2a+1)=(a+1)3 (11)a2(xy)+b2(yx) =a2(xy)b2(xy)=(xy)(a2
7、b2)=(xy)(a+b)(ab);(12)x2xy+y21=(xy)21=(xy+1)(xy1)(13)3a3+12a=3a(a24)=3a(a+2)(a2);(14)a2(xy)4a(yx)+4(xy) =(xy)(a2+4a+4) =(xy)(a+2)2 (15)(a+2)(a2)+3a =a2+3a4 =(a+4)(a1)(16)x32x2+x=x(x22x+1)=x(x1)2;(17)8(x22y2)x(7x+y)+xy=8x216y27x2xy+xy=x216y2=(x+4y)(x4y)(18)4x264=4(x216)=4(x+4)(x4);(19)4ab24a2bb3=b(4a
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