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1、(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) 3a2b2ab22（ab1.5a2b）+ab+3ab2(6)2x3y）+（5x+4y） (7)（8a7b）（4a5b）(8) （3x2y + z）5x(x2y +z ) 3x (9)2（7x2+5x3）3（5x23x+2） (10)2b3 +（3ab3a2b）2（ab2 + b3） (11)（6x2+5xy）12xy（2x29xy） (12)（x22x3 +1）(1+2x3 + 2
2、x2)，其中x=2 (13)3a2b+（4a3b），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)
3、-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)
4、+(-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+
5、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)-( )=x3-2x2
6、y+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4x2-7x
7、2-5x-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x0，y0)等于_. (67) 已知xy，x+y-|x-y|=_. (68) 已知x0，y0，化简|x+y|-|5-x-y|=_. (69) 4a2n-an-(3an-2a2n)=_. (70) 若一
8、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
9、，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-2
10、n)+(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
11、-(+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)-3x-3(4-2x)
12、+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
13、)=_(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=
