1、1有理数计算题1、38+(22)+ (+62 )+ (78) 2、( )+0+(+ )+( )+( ) 324161213、(23)+|63|+ |37| +(77) 4、(-8.25)+8.25+(-0.25)+(-5.75 )+(-7.5) 5、(+18)+(-32)+(-16) +(+26) 6 、5 +(-5 )+4 +( )5325317、(8)+(3 )+2+( )+12 8、(0.8)+(1.2)+(0.6)+(2.4) 21219、(-6.37)+(3 )+6.37+2.75 10、(+ ) ( )( ) 43 103745271011、(+6.1)(4.3)(2.1)5.1
2、12、( )(1 )(1 )(+1.75)32433213(3 )( 2) (1 )(1.75) 14 8 5 4 3 24332 97619215 4 + +( ) 16(0.5)(3 )6.755 361325 4121217 2 -(+10 )+(-8 )-(+3 ) 18598- - -84315125412319(0.25)( )4(7) 20( )( )( ) 4 735412721) -8721+53 -1279+43 (22)4 (96)(0.25) 219 481(23)( 1 + )56 (24) ( )3674843 654397(25)(36)( ) (26)( )(8
3、 0.4)9465127 4334(27)(66)1 ( )( ) (28)25 (25) 25 23154214(29)( + )72 (30) (2 )( )( )187436597 3147258165(31)2(518) (32)1 (3)( )18 31(33) ( )( ) (34)( )( )8714383438765(35)( + )( ) (36) 3.5 ( 0.5) 2983443 6173213(37) 1 (1 )1 (7) (38) ( ) 7265835631245(39) (2 ) 4 (40)0.8 +4.8( )2.2 +0.8755712531272731
4、9(41)( )(154) (42) (2.4) 12754203617318(43)2( ) (5 ) (44)15 - (1 1 3 (1 ) 73471245281(45) (5)( )5 (46)-( - + )( )11312472421(47)-13 -0.34 + (-13 )- 0.34 (48)(-13 ) (-134 ) (- ) 32723175 1367(49)(-1650+3 )( - 2) (50)(- 4 )-(-5 )+(- 4 )- 3 5 872118(51)(-0.5)-(- 3 )+6.75 - 5 (52)178- 87.21+43 +53 12.79
5、4121 2194(53)( )1 + ( ) (54)|3|10( 15) 497521842 31(55) 1 ( ) 2 (56)(2 3 +1 )(1 )(7)53271651128761(57) 3 3( 5)+16(2) 3 45+( 0.625) 285(58) (5)( 5) (5) (59) (4)( )( )( )31075421(60)1(3) 33+ (1 )(2) 23ab-4ab+8ab-7ab+ab=_47x-(5x-5y)-y=_523a3bc2-15ab2c+8abc-24a3bc2-8abc=_6-7x2+6x+13x2-4x-5x2=_72y+(-2y+5
6、)-(3y+2)_11(2x2-3xy+4y2)+(x2+2xy-3y2)=_122a-(3a-2b+2)+(3a-4b-1)=_13-6x2-7x2+15x2-2x2_142x-(x+3y)-(-x-y)-(x-y)_162x+2y-3x-2(x-y)=_175-(1-x)-1-(x-1)=_18( )+(4xy+7x2-y2)=10x2-xy19(4xy2-2x2y)-( )=x3-2x2y+4xy2+y321已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=_22已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=_23若a=-0.2,b=0.5,代数式-(|a
7、2b|-|ab2|)的值为_25一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-51,那么这个多项式等于_26-(2x2-y2)-2y2-(x2+2xy)=_27若-3a3b2与5ax-1by+2是同类项,则x=_,y=_28(-y+6+3y4-y3)-(2y2-3y3+y4-7)_29化简代数式4x2-7x2-5x-3(1-2x+x2)的结果是_302a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( )313a-(2a-3b)+3(a-2b)-b=_32化简代数式x-y-2x-(x+y)等于_335a2+( )a-7+( )a2-4a+( )=a2+2a+1
8、343x-y-(2x+y)=_35化简|1-x+y|-|x-y|(其中x0,y0)等于_36已知xy,x+y-|x-y|=_37已知x0,y0,化简|x+y|-|5-x-y|=_384a2n-an-(3an-2a2n)_39若一个多项式加上-3x2y+2x2-3xy-4得2x2y+3xy2-x2+2xy,则这个多项式为_40-5xm-xm-(-7xm)+(-3xm)=_41当a=-1,b=-2时,a-(b-c)-b-(-c-a)_43当a=-1,b=1,c=-1时,-b-2(-5a)-(-3b+5c)_44-2(3x+z)-(-6x)+(-5y+3z)=_45-5an-an+1-(-7an+1
9、)+(-3an)_463a-(2a-4b-6c)+3(-2c+2b)=_489a2+7a2-2a-(-a2+3a)=_50当2y-x=5时,5(x-2y)2-3(-x+2y)-100=_(4x2-8x+5)-(x3+3x2-6x+2)72(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2)73-2a2b-3abc-(4ab2-a2b)74(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b)75(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2)76(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4)77(4a-2b-c
10、)-5a-8b-2c-(a+b)78(2m-3n)-(3m-2n)+(5n+m)79(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab)80xy-(2xy-3z)+(3xy-4z)81(-3x3+2x2-5x+1)-(5-6x-x2+x3)833x-(2x-4y-6x)+3(-2z+2y)84(-x2+4+3x4-x3)-(x2+2x-x4-5)85若A=5a2-2ab+3b2,B=-2b2+3ab-a2,计算A+B86已知A=3a2-5a-12,B=2a2+3a-4,求2(A-B)872m-3n+-4m-(3m-n)885m2n+(-2m2n)+2mn2-(+m2n)6894
11、(x-y+z)-2(x+y-z)-3(-x-y-z)902(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2)922(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2)93.2x2-3x-4x2-(3x2-x)+(x-x2)94:-(7x-y-2z)-4x-(x-y-z)-3x+z-x95:(+3a)+(-5a)+(-7a)+(-31a)-(+4a)-(-8a)96:a3-(a2-a)+(a2-a+1)-(1-a4+a3)974x-2(x-3)-3x-3(4-2x)+8计算题参考答案:0 - 13/12 0 -13.5 - 4 4 2 -5 -1 - 11/70
12、7.4 1 2.5 - 163/12 -31/4 4 -19 .6 469.6 -4 -0.2 (21)-9903(22)2(23)-19(24)-25(25)-25(26)- 4 .7 (27)-121(28)75/2 (29)78(30)9/28 第一页(31)- 1/117 (32)4/27 (33)- 0.5 (34)3/20(35)-6 .5(36)1(37)- 27/4 (38)- 0.8(39)- 85/84 (40)-7.2 (41)6(42)0.4(43)17/27(44)- 622/63(45)25(46)9(47 )-13.34(48)-2(49)31.3(50)- 27/4 (51)4(52)175(53)83(54)4 .7(55)3/50 (56)14/3
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