整式的加減練習(xí)題有答案

1、19, - (3a2-4ab) +a-2 (2a+2ab).20,5m-7n-8p+5n-9m-p ；21、 (5xy-7xy-) - (xy-3x2y )；22, 3 (_3a_2a) _a2_2 (5a-4a”+l) -3a .23, 3a-9a+5- (-7a+10a-5)；24, -3a2b- (2ab-a2b) - (2ab+4ab2).25 (5a_3a2+l) - ( 4a3-3a2)；26, -2 (ab-3a2) -2b2- (5ab+a2) +2ab27,(8xy/+y) +xSxy)；L28, (2* - 2 +3x)-4(x/+?)；29, 3x- x (4x3) 2x

2、.30, 5a+ (4b-3a) - (-3a+b)；31,(3a2-3ab+2b2) + (a2+2ab-2b2)；32,2a2b+2ab2-2 (a2b-l) +2ab2+2.33,(2a2-l+2a) -3 (a-1 +a-)；34, 2 (x2-xy) -3 (2x2-3xy) -2x2- (2x-xy+y ).2_135、-34 /,+司6+(4 a2b) 136,(8y/ /+/) + ( y+% 8xy)；37, 2x (3x2y+3) (5y2)；38,(3a+2Z?) + (4a36+1) (2ab3)39, 4x ( 6x9 + (-9%)40, 32xy+2yx +6xy

3、4/y41,1-3 (2M?+ a)十1 2 (2a 3a).42,3x5x+(3x2)；43,(3，一疔)at + 3才8)60, -3 (2x-xy) +4 (x+xy-6).61,(x3+3x2y-5xy2+9y3) + (-2y+2xy+xy-2x)- (4x2y-x3-3xy2+7y3)62、-3xJy+2xJy+3xy-2xyS63, 3 (a-2ab) -2 (-3ab+b2)；64, 5abc- 2aLb- 3abc- (4aLb-abJ.65, 5nf- nf + (5m2-2m) -2 (n?-3m).66 -2m-3 (m-n+1)L 67,3 a-( 2 a-4b-6c

4、)+3 (-2c+2b)68、-5a_a- (_7a) + (-3an)69, xJy-3xy2+2yx2-y:xL 2_70、4 a2b-0.4ab2- 2 a2b+ 5 ab2；71, 3a-2c-6a (c-b) +c+ (a+8b-6) 72,-3 (xy-2x-) -y2- (5xy-4xJ) +2xy；73,1化簡,求小5+y?)3 y),其中 x=2, y=-3L L 74,化簡，求值 2 x2(x3/) + (2 x+3 y),其中 ? 整式的加減專項練習(xí)100題1,3 (a+5b) -2 (b-a)2, 3a- (2b-a) +b3, 2 (2+9b) +3 (-5a-4b)

5、4、 (x；!-2y-3x:y)一 (3x3-3y3-7x2y)5,3x2-7x- (4x-3) -2x26、(2xy-y) - (-y+yx)7, 5 (ab-3ab2) -2 (a2b-7ab)8、(-2ab+3a)-2 (2a-b) +2ab9,(7m n-5mn) 一 (4m n-5mn)10,(5a2+2a-l) -4 (3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2 ；12、2 (a-1) _ (2a_3) +3.13, -2 (ab-3a2) -2b2- (5ab+a2) +2ab14,(x2-xy+y) -3 (x+xy-2y)15, 3xJ-7x- (4x

6、-3) -2x116、a b-2 (a2b-2ac) - (2bc+a2c)；17, -2y3+ (3xyJ-xJy) -2 (xy2-y3).18, 2 (2x-3y) - (3x+2y+l)44,45,( x+5 + 4/) + ( /+5x-4)46,(5a-2a+3) - (l-2a+a2) +3 (-l+3a-a2).47, 5 (3a2b-ab2) -4 (-ab2+3a2b).48, 4a2+2 (3ab-2a2) - (7ab-l). 49,2 Xy+ (-4 Xy) -2xy2- (-3y2x)50,5a2- a2- (5a2-2a) 2 (a2-3a)51, 5m-7n-8

7、p+5n-9m+8P52,(5xJy-7xy2) - (xy2-3xJy)53,3xJy-2xy-3 (2xy-x,y) -xy54,3x2-5x-4( 2 x2-l) +5x2L 55, 2a3b- 2 a3b-a2b+ 2 a2b-ab2；56(a+4ab-4b)一3 (aJ+b-) -7 (b2-ab).57,aJ+2a,+ (-2a) + (-3a1) +3a，58, 5ab+ (-4a:V) +8ab2- (-3ab) + (-a2b) +4a2b2；59,(7y-3z) - (8y-5z)；75,75,其中x= i 2 ；2_176 化簡，求值(4m+n) -1 - (m-4n)

8、, m= n=T)77, 化簡， 求值 2 cf b-21ja) +3a3(2ba+3a) 一4兄其中 =-3, b=278, 化簡，求值：(2x3-xyz) -2 (x3-y3+xyz) + (xyz-2y3), 其中 x=l, y=2, z=79,化簡，求值：5x-3x-2 (2x-3) +7x2,其中 x=-2.80假設(shè)兩個多項式的和是2x?+xy+3y之,一個加式是x?-xy,求 另一個加式.81,假設(shè)2a-4ab+b及一個多項式的差是-3a“Zab-Sb、試求這 個多項式.求5fy2x,y及一2才/+ 4X2夕的和.求 3V+x5 及 4 x+7V的差. 2284,計算 5y+3x+

9、5z 及 12y+7x-3z 的和222285,計算 8xy +3x y-2 及-2x y+5xy -3 的差 86,多項式-x“+3xy-2 y及多項式M的差是-2 x2-xy+y,求多項式M187、當(dāng) x=- 2 , y=-3 時,求代數(shù)式 3 (x2-2xy) -3x2-2y+2 (xy+y)的值.22288、化簡再求值 5abe-2a b-3abc- ( 4ab -a b )- 2ab? ,其中 a=-2, b=3, c=-4222289, A=a -2ab+b , B=a +2ab+b(1)求A+B；(2)求 4 (B-A)；90,小明同學(xué)做一道題，兩個多項式A, B,計算A+B,

10、他誤將A+B看作A-B,求得9x?-2x+7,假設(shè)B=x?+3x-2,你 能否幫助小明同學(xué)求得正確答案？91, ：M=3x2+2x-1, N=-x-2+3x,求 M-2N.92,上上 一,求3A-B293 A=*+xy+7, B= 3xyV,求 2A3B.94, I*+ (5+1尸=0,求 5a6一_2cfb (4n一2兒)的值.95, 化簡求值：5abc-2a2b+3abc-2 (4ab2-a2b),其中 a, b, c 滿意 |aT | + |b-2|+c=0.96、 a, b, z 滿意：(1) |x-2|+ (y+3) 2=0, (2) z 是最大的負(fù)整數(shù)，化簡求值：2 (xy+xyz

11、) -3 (xy-xyz) -4xy.97, a+b=7, ab=10,求代數(shù)式(5ab+4a+7b) + (6a-3ab) - (4ab-3b)的值.98、 m +3nm=5,求 5nli-+5痛- (2m2-mn) -7nm-5的值設(shè) A=2x2-3xy+y2+2x+2y, B=4x2-6xy+2y2-3x-y,假設(shè) | x- 22a | + (y-3)=0,且 B-2A二a,求 a 的值.有兩個多項式：A = 23-4a+l, B=2(3一2a)+3,當(dāng) a取隨意有理數(shù)時，請比擬A及B的大小.答案：1,3 (a+5b) -2 (b-a) =5a+13b3a- (2b-a) +b=4a-b

12、.222 (2a+9b) +3 (-5a2-4b) Ila +6b”(x -2y-3x y) - (3x-3y-7x: y)- -Zx y xy5, 3x2-7x- (4x-3) -2x = 5x2 -3x-3(2xy-y) - (-y+yx) = xy TOC o 1-5 h z 22225 (a b-3ab ) -2 (a b-7ab) = -a b+1 lab(-2ab+3a) -2 (2a-b) +2ab=-2a+b222(7m n-5mn) - (4m n-5mn) = 3m n(5a+2a-l) -4 (3-8a+2a2) = -3a2+34a-13222222-3x y+3xy

13、+2x y-2xy = -x y+xy2 (a-l) - (2a-3) +3. =42222-2 (ab-3a ) - 2b - (5ab+a ) +2ab= 7a +ab-2b -222(x -xy+y) -3 (x +xy-2y) = -2x -4xy+7y22215, 3x -7x- (4x-3) -2x =5x -3x-316, aJb-2 (aJb-2a2c) - (2bc+ac) = -ab+2bc+6ac-2y+ (3xy2-x2y) -2 (xy2-y3) = xy2-x2y2 (2x-3y) - (3x+2y+l) =2x-8y-l- (3a-4ab) +a2-2 (2a+2

14、ab) =-2a -4a5m-7n-8p+5n-9m-p 二 一4nl-2n-9P21,(5x2y-7xy2) - (xy2-3x y) =4xy2-4x2y22, 3 (-3a-2a) - a-2 (5a-4a2+l) -3a=-18a2 +7a+223, 3a2-9a+5- (-7a+1 Oa-5)= 10a2-19a+1024, -3a b- (2ab2-a b) - (2ab+4abJ) = -4a-b-64ab25、(5a-3aJ+l) - (4a-3aJ) =5a-4a”+l26, -2 (ab-3a2) -2b2- (5ab+a2) +2ab=7a +ab-2b(8xyx +y)

15、 + (y+x8xy)=0 (2-2 +3x)-4(x/+? ) = 6x -x23/- _lx- (4%-3)-2/= 5V3x35a+ (4b-3a) - (-3a+b) = 5a+3b TOC o 1-5 h z 22222(3a -3ab+2b ) + (a +2ab-2b ) = 4a -ab22222a b+2ab _2 (a b-l) +2ab +2.= _1(2aJ-l+2a) -3 (a-1 +a2)= -a2-a+22 (x-xy) -3 (2x:-3xy) -2 Ex2- (2x2-xy+y2) =-2x2+5xy- HYPERLINK l bookmark16 o Cu

16、rrent Document 2_11-3 血+4 10+劭+(-4 才Z?)1 = 3 ab-l(8xyx +y) + (/+/8=02x (3x2y+3) (5y2)=-x-3y-l38, -(3a+2b) + (4a3b+l) (2aZ?-3)= -a-4b+44x ( 6x) + ( 9x3) = x3 2盯+2yV+6xy4,/y - -2 寸y+441f1-3 (2 / + a) +1-2 (2a 3 公)=2-7a42,3x5x+(3x2) =_5x+243,(33力a加)(a/+33。)=-2 a If45,( -/+5+4/) + ( /+5-4)= 3x V+5xA/46,

17、(5a2-2a+3) - (l-2a+a2) +3 (-l+3a-a2) =a2+9a-l5 (3aJb-ab2) -4 (-ab2+3a2b). =3aJb-ab24a“2 (3ab-2a2) - (7abT) =l-ab 2 Xy+ (-4 xy) -2xy2- (-3y2x) =4 xy+xy5a2-a2- (5a-2a) -2 (a2-3a) =lla2-8a51,5m-7n-8p+5n-9m+8p=-4m-2n52,(5xJy-7xy2) - (xy2-3xLy) =8x2y-6xyJ53,3x2y-2x2y-3 (2xy-xy) -xy=-2x2y+7xy1723x2-5x-4(，

18、x2-1) +5x2 = lOx -5x-4 L 3_2a3b- 2 a3b-a2b+ 2 a2b-ab2 =、a3b- 2 a2b-ab2(a2+4ab-4b2) -3 (a2+b2) -7 (b2-ab) =-2a2+llab-14b2a2+2a+ (-2a3) + (-3a3) +3a2 = -3a3+4a25ab+ (-4ab)+8ab - (-3ab ) + (-a b ) +4a2b=8ab+8ab2-a2b(7y-3z) - (8y-5z)=-y+2z60, -3 (2x2-xy) +4 (x+xy-6) =-2x2+7xy-2461,(x3+3x2y-5xy2+9y+ (-2y

19、+2xy+xy-2x)- (4xy-x-3xy2+7y:1) =0-3xJy+2xJy+3xy:;-2xy2 =-xJy+xy23 (a -2ab) -2 (-3ab+b2) =3a -2b5abc- 2ab- 3abc- (4a-b-abL =8abc-6a2b+ab(5mJ-2m) -2 (mJ-3m) =m2-4m-2m_3 (m-n+l) -2-1=m-3n+4L LL3 a-( - a-4b-6c) +3 (-2c+2b) = - 6 a+10b-5an-an- (-7an) + (-3an)二-2an 69, xy-3xyJ+2yx2-yJx=3xy-4xy 71 4 a2b-0.

20、 4ab2- 1 a2b+ 5 abJ = 一 4 2b3a_2c_6a_ (c-b) +c+ (a+8b-6) = 10a+9b_2c_6 TOC o 1-5 h z 22-3 (xy-2x ) -yJ- (5xy-4x“)+2xy= 2x -y ) / 322- (*x，+ y，)73,化簡，求值2 L2(3 x + HYPERLINK l bookmark12 o Current Document 14其中x= -12 ；_ ,32o-原式二x +x -x+6=6?；啠笾?4m+n) -1- (m-4n) , m= 5 n二T 3 原式=5m - 3nT=5化簡， 求值 2a at)

21、 +3a (2。才-3aZ/+3H)4其中 a=3, b=2原式二-2刈3+3加2=12化簡，求值：(2x -xyz) -2 (x-y,+xyz) + (xyz-2y)， 其中 x=l, y=2, z=-3.原式=-2xyz=679,化簡，求值：5x-3x-2 (2x-3) +7x1,其中 x=-2.2原式二-2x +x-6=T680,假設(shè)兩個多項式的和是2x、xy+3y，一個加式是父-xy,求 另一個加式.(2x2+xy+3y2 ) - ( x2-xy) = x2+2xy+3y281,假設(shè)2a2-4知+”及一個多項式的差是-3/+2ab-5b2,試求這 個多項式.(2a2-4ab+b2 )

22、(-3a2+2ab-5b2) =5a2 -6ab+6b2求 5x及-2x/+4x/的和.(5/y2/y? + (2xy+4xy) =3x/+2x y求 3*+x5 及 4 x+7x?的差.(3*+x5) (4 x+7f) =+2x9 TOC o 1-5 h z 2284,計算 5y+3x+5z 及 12y+7x-3z 的和222(5y+3x+5z ) + (12y+7x-3z ) =17y+10 x+2z 222285,計算 8xy +3x y-2 及-2x y+5xy -3 的差222222(8xy +3x y-2) (-2x y+5xy - 3) =5x y+3xy +1 HYPERLIN

23、K l bookmark6 o Current Document L86,多項式-x +3xy- 2 y及多項式M的差是-2 xxy+y,求多項式M M=- 2 xJ+4xy 2 y187,當(dāng) x=- 2 , y=-3 時，求代數(shù)式 3 (x-2xy) - 3x-2y+2 (xy+y)的值.原式二一8xy+y二一15 TOC o 1-5 h z 22288, 化簡再求值 5abc-2a b-3abc- (4ab -a b)-2ab ,其中 a=-2, b=3, c=-422原式二 83abe-a b-2ab =36222289, A=a -2ab+b , B=a +2ab+b(1)求A+B；(2)求 4 (B-A)；122 TA+B=2a +2b4 (B-A)