整式加减混合运算

(1) 7-3x-4x2 +4x-8x2 -15 (2) 2(2a2 -9b)-3(－4a2 +b) (3) 8x2-[-3x-(2x2-7x-5)+3]+4x (4)(5x-3y-2xy)-(6x+5y-2xy)

(5) 3a2b－[2ab2－2（ab－1.5a2b）+ab]+3ab2

(6)2x－3y）+（5x+4y）(7)（8a－7b）－（4a－5b）

(8) －（3x－2y + z）－[5x－(x－2y +z ) －3x]

(9)2（7x2+5x－3）－3（5x2－3x+2）

(10)2b3 +（3ab3－a2b）－2（ab2 + b3）

(11)（－6x2+5xy）－12xy－（2x2－9xy）

(12)（x2－2x3 +1）－(－1+2x3 + 2x2)，其中x=2

(13)3a－[－2b+（4a－3b）]，其中a=－1，b=3

(14)3ab-4ab+8ab-7ab+ab= (15)7x-(5x-5y)-y=

(16)23a3bc2-15ab2c+8abc-24a3bc2-8abc=

(17)-7x2+6x+13x2-4x-5x2= (18)2y+(-2y+5)-(3y+2)＝(19)(2x2-3xy+4y2)+(x2+2xy-3y2)= (20)2a-(3a-2b+2)+(3a-4b-1)= (21) -6x2-7x2+15x2-2x2＝(22)2x-(x+3y)-(-x-y)-(x-y)＝(23)2x+2y-[3x-2(x-y)]= 5-(1-x)-1-(x-1)=

(24)已知A=x3-2x2+x-4，B=2x3-5x+3，计算A+B=

(25)若a=-0.2，b=0.5，代数式-(|a2b|-|ab2|)的值为

(26)-(2x2-y2)-[2y2-(x2+2xy)]= (27)(-y+6+3y4-y3)-(2y2-3y3+y4-7)＝

(28)4x2-[7x2-5x-3(1-2x+x2)]=

(29)3a-(2a-3b)+3(a-2b)-b=

(30)x-[y-2x-(x+y)] = 3x-[y-(2x+y)]=

(31)4a2n-an-(3an-2a2n)＝

(32)2x2y+3xy2-x2+2xy=

(33)-5xm-xm-(-7xm)+(-3xm)=

(34)当a=-1，b=-2时，[a-(b-c)]-[-b-(-c-a)]＝

(35)当a=-1，b=1，c=-1时，-[b-2(-5a)]-(-3b+5c)＝

(36)-2(3x+z)-(-6x)+(-5y+3z)=

(37)-5an-an+1-(-7an+1)+(-3an)＝

(38)3a-(2a-4b-6c)+3(-2c+2b)=

(39)9a2+[7a2-2a-(-a2+3a)]=

(40)当2y-x=5时，5(x-2y)2-3(-x+2y)-100=

(41)3ab-4ab+8ab-7ab+ab=

(42)7x-(5x-5y)-y=

(43)23a3bc2-15ab2c+8abc-24a3bc2-8abc=

(44)-7x2+6x+13x2-4x-5x2=______.

(45)2y+(-2y+5)-(3y+2)=______.

(46)(2x2-3xy+4y2)+(x2+2xy-3y2)=______.

(47)2a-(3a-2b+2)+(3a-4b-1)=______.

(48)-6x2-7x2+15x2-2x2=______.

(49)2x-(x+3y)-(-x-y)-(x-y)=______.

(50)2x+2y-[3x-2(x-y)]=______.

(51)5-(1-x)-1-(x-1)=______.

(52)( )+(4xy+7x2-y2)=10x2-xy.

(53)(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3.

(54)已知A=x3-2x2+x-4，B=2x3-5x+3，计算A+B=______.

(55)已知A=x3-2x2+x-4，B=2x3-5x+3，计算A-B=______.

(56)若a=-0.2，b=0.5，代数式-(|a2b|-|ab2|)的值为______. 25.一个多

项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1，那么这个多项式等于______.

(57)-(2x2-y2)-[2y2-(x2+2xy)]=______.

(58)若-3a3b2与5ax-1by+2是同类项，则x=______，y=______.

(59)(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______.

(60)化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______.

(61)2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ).

(62)3a-(2a-3b)+3(a-2b)-b=______.

(63)化简代数式x-[y-2x-(x+y)]=______.

(64)[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1.

(65)3x-[y-(2x+y)]=______.

(66)化简|1-x+y|-|x-y|(其中x＜0，y＞0)等于______.

(67)已知x≤y，x+y-|x-y|=______.

(68)已知x＜0，y＜0，化简|x+y|-|5-x-y|=______.

(69)4a2n-an-(3an-2a2n)=______.

(70)若一个多项式加上-3x2y+2x2-3xy-4得2x2y+3xy2-x2+2xy，则

这个多项式为______.

(71)-5xm-xm-(-7xm)+(-3xm)=______.

(72)当a=-1，b=-2时，[a-(b-c)]-[-b-(-c-a)]=______.

(73)当a=-1，b=1，c=-1时，-[b-2(-5a)]-(-3b+5c)=______.

(74)-2(3x+z)-(-6x)+(-5y+3z)=______.

(75)-5an-an+1-(-7an+1)+(-3an)=______.

(76)3a-(2a-4b-6c)+3(-2c+2b)=______.

(77)9a2+[7a2-2a-(-a2+3a)]=______.

(78)当2y-x=5时，5(x-2y)2-3(-x+2y)-100=______

(79)(4x2-8x+5)-(x3+3x2-6x+2).

(80)(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2).

(81)-{2a2b-[3abc-(4ab2-a2b)]}.

(82)(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b).

(83)(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2).

(84)(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4).

(85)(4a-2b-c)-5a-[8b-2c-(a+b)]

(86)(2m-3n)-(3m-2n)+(5n+m).

(87)(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab).

(88)xy-(2xy-3z)+(3xy-4z).

(89)(-3x3+2x2-5x+1)-(5-6x-x2+x3).

(90)3x-(2x-4y-6x)+3(-2z+2y).

(91)(-x2+4+3x4-x3)-(x2+2x-x4-5).

(92)若A=5a2-2ab+3b2，B=-2b2+3ab-a2，计算A+B.

(93)已知A=3a2-5a-12，B=2a2+3a-4，求2(A-B).

(94)2m-{-3n+[-4m-(3m-n)]}.

(95)5m2n+(-2m2n)+2mn2-(+m2n).

(96)4(x-y+z)-2(x+y-z)-3(-x-y-z).

(97)2(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2).

(98)2(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2).

(99)2x2-{-3x-[4x2-(3x2-x)+(x-x2)]}.

(100)-(7x-y-2z)-{[4x-(x-y-z)-3x+z]-x}.

(101)(+3a)+(-5a)+(-7a)+(-31a)-(+4a)-(-8a). (102)a3-(a2-a)+(a2-a+1)-(1-a4+a3).

(103)4x-2(x-3)-3[x-3(4-2x)+8].

(104)3ab-4ab+8ab-7ab+ab=______．

(105)7x-(5x-5y)-y=______．

(106)23a3bc2-15ab2c+8abc-24a3bc2-8abc=______．(107)-7x2+6x+13x2-4x-5x2=______．

(108)2y+(-2y+5)-(3y+2)＝______．

(109)(2x2-3xy+4y2)+(x2+2xy-3y2)=______．(110)2a-(3a-2b+2)+(3a-4b-1)=______．(111)-6x2-7x2+15x2-2x2＝______．(112)2x-(x+3y)-(-x-y)-(x-y)＝______．(113)2x+2y-[3x-2(x-y)]=______．

(114)5-(1-x)-1-(x-1)=______．

(115)( )+(4xy+7x2-y2)=10x2-xy．

(116)(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3

(117)已知A=x3-2x2+x-4，B=2x3-5x+3，计算A+B=______．(118)已知A=x3-2x2+x-4，B=2x3-5x+3，计算A-B=______．(119)若a=-0.2，b=0.5，代数式-(|a2b|-|ab2|)的值为______．

(120)．一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1，那么这个多项式等于______．

(121)．-(2x2-y2)-[2y2-(x2+2xy)]=______．

(122)若-3a3b2与5ax-1by+2是同类项，则x=______，y=______．

(123)(-y+6+3y4-y3)-(2y2-3y3+y4-7)＝______．

(124)化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______．(125)2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( )．

(126)3a-(2a-3b)+3(a-2b)-b=______．

(127)化简代数式x-[y-2x-(x+y)]等于______．

(128)[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1．

(129)．3x-[y-(2x+y)]=______．

(130)4a2n-an-(3an-2a2n)＝______．

(131)若一个多项式加上-3x2y+2x2-3xy-4得 2x2y+3xy2-x2+2xy，则这个多项式为______．

(132)-5xm-xm-(-7xm)+(-3xm)=______．

(133)当a=-1，b=-2时，[a-(b-c)]-[-b-(-c-a)]＝______．

(134)当a=-1，b=1，c=-1时，-[b-2(-5a)]-(-3b+5c)＝______．

(135)-2(3x+z)-(-6x)+(-5y+3z)=______．

(136)-5an-an+1-(-7an+1)+(-3an)＝______．

(137)3a-(2a-4b-6c)+3(-2c+2b)=______．

(138)9a2+[7a2-2a-(-a2+3a)]=______．

(139)当2y-x=5时，5(x-2y)2-3(-x+2y)-100=______．(140)16.-2(3x+z)-(-6x)+(-5y+3z)

(141)-5an-an+1-(-7an+1)+(-3an)

(142)2a-（3a-2b+2）+（3a-4b-1)

(143)3a-(2a-4b-6c)+3(-2c+2b)

(144)9a2+[7a2-2a-(-a2+3a)]

(145)2a-(3a-2b+2)+(3a-4b-1)

(146)2a2-(3a2-2b2+2ab+2)+(3a2-4b2-1) (147)2y2+(2y-5)2-(3y+2)2

(148)3ab2-4a2b+8a2b-7ab2+3ab (149)4x2-[7x2-5x-3(1-2x+x2)] (150)2x+2y-[3x-2(x-y)]