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1、精选优质文档-倾情为你奉上初一上册整式计算题 (一)填空33ab-4ab+8ab-7ab+ab=_47x-(5x-5y)-y=_523a3bc2-15ab2c+8abc-24a3bc2-8abc=_ 6-7x2+6x+13x2-4x-5x2=_ 72y+(-2y+5)-(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+7
2、x2-y2)=10x2-xy 19(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3 21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-(|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_ 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
3、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 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+
4、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)+(-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=_ (二)选择 A2; B-2; C-10; D-6 52下列各式中计算结果
5、为-7x-5x2+6x3的是 A3x-(5x2+6x3-10x); B3x-(5x2+6x3+10x); C3x-(5x2-6x3+10x); D3x-(5x2-6x3-10x) 53把(-x-y)+3(x+y)-5(x+y)合并同类项得 A(x-y)-2(x+y); B-3(x+y); C(-x-y)-2(x+y); D3(x+y) 542a-3b-5a-(2a-7b)等于 A-7a+10b; B5a+4b; C-a-4b; D9a-10b 55减去-3m等于5m2-3m-5的代数式是 A5(m2-1); B5m2-6m-5; C5(m2+1); D-(5m2+6m-5) 56将多项式2ab
6、-9a2-5ab-4a2中的同类项分别结合在一起,应为 A(9a2-4a2)+(-2ab-5ab); B(9a2+4a2)-(2ab-5ab); C(9a2-4a2)-(2ab+5ab); D(9a2-4a2)+(2ab-5ab) 57当a=2,b=1时,-a2b+3ba2-(-2a2b)等于 A20; B24; C0; D16 中,正确的选择是 A没有同类项; B(2)与(4)是同类项; C(2)与(5)是同类项; D(2)与(4)不是同类项 59若A和B均为五次多项式,则A-B一定是 A十次多项式; B零次多项式; C次数不高于五次的多项式; D次数低于五次的多项式 60-(x+y)+-(
7、x+y)等于 A0; B-2y; Cx+y; D-2x-2y 61若A=3x2-5x+2,B=3x2-5x+6,则A与B的大小是 AAB; BA=B; CAB; D无法确定 62当m=-1时,-2m2-4m2+(-m2)等于 A-7; B3; C1; D2 63当m=2,n=1时,多项式-m-(2m-3n)+-(-3m)-4n等于 A1; B9; C3; D5 65-5an-an-(-7an)+(-3an)等于 A-16an; B-16; C-2an; D-2 66(5a-3b)-3(a2-2b)等于 A3a2+5a+3b; B2a2+3b; C2a3-b2; D-3a2+5a-5b 67x3
8、-5x2-4x+9等于 A(x3-5x2)-(-4x+9); Bx3-5x2-(4x+9); C-(-x3+5x2)-(4x-9); Dx3+9-(5x2-4x) 694x2y-5xy2的结果应为 A-x2y; B-1; C-x2y2; D以上答案都不对 (三)化简 70(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+2z
9、2) 76(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4) 77(4a-2b-c)-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+B 86已知A=3a2-5a-12,B=2a2+3a-
10、4,求2(A-B) 872m-3n+-4m-(3m-n) 885m2n+(-2m2n)+2mn2-(+m2n) 894(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) 944x-2(x-3)-3x-3(4-2x)+8 (四)将下列各式先化简,再求值 97已知a+b=2,a-b=-1,求3(a+b)2(a-b)2-5(a+b)2(a-b)2的值 98已知A=a2+2b2-3c2,B=-b2-2c2+3a2,C=c2+2a2-3b2,求(A-B)
11、+C 99求(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2 101已知|x+1|+(y-2)2=0,求代数式5(2x-y)-3(x-4y)的值 106当P=a2+2ab+b2,Q=a2-2ab-b2时,求P-Q-2P-(P-Q) 107求2x2-3x+5+4x2-(3x2-x-1)的值,其中x=-3 110当x=-2,y=-1,z=3时,求5xyz-2x2y-3xyz-(4xy2-x2y)的值 113已知A=x3-5x2,B=x2-6x+3,求A-3(-2B) (五)综合练习 115去括号:-(a+b)-(a-b) 116去括号:-(-x)-y-+(-y)-(+x) 117
12、已知A=x3+6x-9,B=-x3-2x2+4x-6,计算2A-3B,并把结果放在前面带“-”号的括号内 118计算下式,并把结果放在前面带“-”号的括号内: (-7y2)+(-4y)-(-y2)-(+5y)+(-8y2)+(+3y) 119去括号、合并同类项,将结果按x的升幂排列,并把后三项放在带有“-”号的括号内: 120不改变下式的值,将其中各括号前的符号都变成相反的符号:(x3+3x2)-(3x2y-7xy)+(2y3-3y2) 121把多项式4x2y-2xy2+4xy+6-x2y2+x3-y2的三次项放在前面带有“-”号的括号内,二次项放在前面带有“+”号的括号内,四次项和常数项放在
13、前面带有“-”号的括号内 122把下列多项式的括号去掉,合并同类项,并将其各项放在前面带有“-”号的括号内,再求2x-23x-(5x2-2x+1)-4x2的值,其中x=-1 123合并同类项: 7x-1.3z-4.7-3.2x-y+2.1z+5-0.1y 124合并同类项:5m2n+5mn2-mn+3m2n-6mn2-8mn 126去括号,合并同类项: (1)(m+1)-(-n+m); (2)4m-5m-(2m-1) 127化简:2x2-3x-4x2-(3x2-x)+(x-x2) 128化简:-(7x-y-2z)-4x-(x-y-z)-3x+z-x 129计算:(+3a)+(-5a)+(-7a
14、)+(-31a)-(+4a)-(-8a) 130化简:a3-(a2-a)+(a2-a+1)-(1-a4+a3) 131将x2-8x+2x3-13x2-2x-2x3+3先合并同类项,再求值,其中x=-4 132在括号内填上适当的项:( )-9y+( )+2y2+3y-4=11y2-( )+13 133在括号内填上适当的项: (-x+y+z)(x+y-z)=y-( )y+( ) 134在括号内填上适当的项: (3x2+xy-7y2)-( )=y2-2xy-x2 135在括号内填上适当的项: (1)x2-xy+y-1=x2-( ); (2)( )+6x-7-4x2+( )-( )=x2-2x+1 1
15、36计算4x2-3x+4(1-x)-x2-2(4x2-1)的值 137化简: 138用竖式计算 (-x+5+2x4-6x3)-(3x4+2x2-3x3-7) 139已知A=11x3+8x2-6x+2,B=7x3-x2+x+3,求2(3A-2B) 140已知A=x3-5x2,B=x3-11x+6,C=4x-3,求 (1)A-B-C; (2)(A-B-C)-(A-B+C) 141已知A=3x2-4x3,B=x3-5x2+2,计算 (1)A+B; (2)B-A 142已知x-4,化简|-x|+|x+4|-|x-4| 146求两代数式-1.56a+3.2a3-0.47,2.27a3-0.02a2+4.03a+0.53的差与6-0.15a+3.24a2+5.07a3的和 -0.3,y=-0.2 150已知(x-3)2+|y+1|+z2=0,求x2-2xy-5x2+12xz+3xy-z2-8xz-2x2的值1.已知ab2=6,求ab(ab3=a2b5-b)的值2.已知 1/x-1/y=3,求(2y-3xy-2x)/(y+2xy-x)的值专心-专注-专业