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去括号合并同类项篇一整理合并同类项和去括号练习题、合并同类项()()1()[()];()()()14x+2y—5x—y2—3ab+7—2a2—9ab—3()()3x+x+-2x-4y4a+4b-3a-6b(()53x2-1-2x-5+3x-x26-
0.8a2b-6ab-
1.2a2b+5ab+a2b()++(-)()-(-+)7a2ab a2ab b286x2y+2xy-3x2y2-7x-5yx-4y2x2-6x2y()+(+)()(-)-(-)98x2y25x2y103a4b2a1()()117m3m2n12x2y242x23y2()()133x2-1-2x-5+3x-x2144xy-3y2-3x2+xy-3xy-2x2-4y2()()()()()15-
0.8a2b-6ab-
1.2a2b+5ab+a2b15a2ab a2ab b2()165a-b2-7a-b+3a-b2-9a-b()173xn+1-4xn-1+xn+1+xn-1+5xn-2xn()183x2-1-2x-5+3x-x2()19-
0.8a2b-6ab-
1.2a2b+5ab+a2b()20a2ab a2ab b2();()216x2y+2xy-3x2y2-7x-5yx-4y2x2-6x2y()224x2y-8xy2+7-4x2y+12xy2-423a2-2ab+b2+2a2+2ab-b
2.()243x2-1-2x-5+3x-x2()25-
0.8a2b-6ab-
1.2a2b+5ab+a2b()26a2ab a2ab b2();276x2y+2xy-3x2y2-7x-5yx-4y2x2-6x2y()284x2y-8xy2+7-4x2y+12xy2-
4、先去括号,再合并同类项29a2-2ab+b2+2a2+2ab-b
2.2312342312342312342312341232()()();()()();212x-3y+5x+4y28a-7b-4a-5b()()();()()();()[()];()()()3a-2a+b+2a-2b435x+4-3x-5()++(-)()(-)-(-)5x+x+-2x-4y6a+4b-3a-6b()()()()()78x2y25x2y8x2y242x23y2()()()()()()95x2y2xy24x2y104ab4ab a23a
2、如果关于字母的代数的值与的取值无关,求,的1122xy y yx2y126m2n5mn26m2n mn2值3x-3x2+mx+nx2-x+10x mn、求下列代数式的值,其中,.、已知,,求的值43m2n-mn2-
1.2mn+mn2-
0.8mn-3m2n m=6n=2()()、已知(),求()52x2+xy=103y2+2xy=64x2+8xy+9y
2.、化简求值2x y3y x26|x-y-3|+a+b+4=02a2b a b()-+-(-)-,=-
7.()()--(-),其中=-,=15a32a2a2a33a21a
1.、先化简,再求值()(),其中224a2b[3ab223a2b1]a
0.1b18m m134m m、化简()()
3.、已知,,,计算--[-(-)]的值97a2b4a2b5ab22a2b3ab
2.、已知与-是同类项,计算-(-)(-10a=1b=2c=2a3b3abc2b a+2abc.)的值112xmy23xyn m m2n+3m4n+2nm
2、把()当作一个整体化简,()-()()3n.()12a+b5a+b2a+b+2a+b2+
2、如果关于的多项式---的值与的取值无关,求、a+b.123252的值13x2x2+mx+nx25x1x m、求代数式的值n()其中14()其中,()其中,16x+2x2-3x+x2+1x=
5、先化简,再求值24x2+3xy-x2-9x=2y=-33m-n-n-m m=6n=2()(+)+(-)-(+),其中,=,=1514y141x4x y x y1()--(-),其中=-,=
714313325616、求值(),其中24a2b[3ab223a2b1]a
0.1b1(),其中,()先化简,后求值221612x5x x4x x
3、已知,,()求的值;()求的值;12x2yy3x6y123篇二合并同类项和去括号练习题17a=3x2x1b=x211a-2b22a-6b、合并同类项()()1()[()];()()()14x+2y—5x—y2—3ab+7—2a2—9ab—3()()3x+x+-2x-4y4a+4b-3a-6b(53x2-1-2x-5+3x-x26-
0.8a2b-6ab-
1.2a2b+5ab+a2b7a3221()2ab3()++(-)()-(-+)4a2ab b286x2y+2xy-3x2y2-7x-5yx-4y2x2-6x2y()+(+)()(-)-(-)98x2y25x2y103a4b2a1()()117m3m2n12x2y242x23y2()()133x2-1-2x-5+3x-x2144xy-3y2-3x2+xy-3xy-2x2-4y215-
0.8a2b-6ab-
1.2a2b+5ab+a2b1523a212ab3()()()()()4a2ab b2()165a-b2-7a-b+3a-b2-9a-b()173xn+1-4xn-1+xn+1+xn-1+5xn-2xn2213()183x2-1-2x-5+3x-x2()19-
0.8a2b-6ab-
1.2a2b+5ab+a2b2023a212ab3()4a2ab b2();()216x2y+2xy-3x2y2-7x-5yx-4y2x2-6x2y()224x2y-8xy2+7-4x2y+12xy2-423a2-2ab+b2+2a2+2ab-b
2.()243x2-1-2x-5+3x-x2()25-
0.8a2b-6ab-
1.2a2b+5ab+a2b2623a212ab3()4a2ab b2();276x2y+2xy-3x2y2-7x-5yx-4y2x2-6x2y()284x2y-8xy2+7-4x2y+12xy2-
4、先去括号,再合并同类项29a2-2ab+b2+2a2+2ab-b
2.()()();()()();2()()();()()();12x-3y+5x+4y28a-7b-4a-5b()[()];()()()3a-2a+b+2a-2b435x+4-3x-5()++(-)()(-)-(-)5x+x+-2x-4y6a+4b-3a-6b、如果关于字母的代数的值与的取值无关,求,的78x2y25x2y8x2y242x23y2值3x-3x2+mx+nx2-x+10x mn求下列代数式的值,其中,.、已知,,求的值
4.3m2n-mn2-
1.2mn+mn2-
0.8mn-3m2n m=6n=
2、已知(),求52x2+xy=103y2+2xy=64x2+8xy+9y
2.、化简求值6|x-y-3|+a+b+4=0()-+-(-)-,=-
7.()()--(-),其中=-,=15a32a2a2a33a21a
1.先化简,再求值224a2b[3ab223a2b1]a
0.1b
18.3()(),其中2m5()()()2m134m m化简()()
3.2x y3y x2a2b a b2已知,,,计算--[-(-)]
9.7a2b4a2b5ab22a2b3ab
2.的值
10.a=1b=2c=2a3b3abc2b a+2abc21已知与-是同类项,计算-(-)(-).的值112xmy23xyn mm2n+3m4n+2nm23n把()当作一个整体化简,()-()()().如果关于的多项式---的值与的取值无关,求、的12a+b5a+b2a+b+2a+b2+2a+b.13值x2x2+mx+nx25x1x mn、求代数式的值()其中14()其中,()其中,16x+2x2-3x+x2+1x=5先化简,再求值24x2+3xy-x2-9x=2y=-33m-n-n-mm=6n=232661351()(+)+(-)-(+),其中,=,=
15.()--(-),其中=-,=14y141x4x y x y
71143、求值(),其中24a2b[3ab223a2b1]a
0.1b11612x25x x4x2x3()1()先化简,后求值,其中,3x2y2篇三合并同类项、去括号练习题()3y2x6y1合并同类项、去括号试题2合并下列各式中的同类项()()
1.()()13x2-1-2x-5+3x-x224xy-3y2-3x2+xy-3xy-2x2-4y2()()()()()()2133-
0.8a2b-6ab-
1.2a2b+5ab+a2b4a2ab a2ab b23241355a-b2-7a-b+3a-b2-9a-b63xn+1-4xn-1+xn+1+xn-1+5xn-2xn()-(-+)()-[(+)-(-)]22()()()()()()(73a4b2a18x3x14x)135a4b3a3a b142a253a222()()()()4a21()()()()()15x5x3y1x2y1162a3a2b a178x2y4x3y z2z182a b3a2b a()++(-)()(-)-(-)2a()-(-+)()(-+)-(--)+198x2y25x2y20x2y242x23y2()()(6-+)-(+-()2132x3y3x2y23xy3224y35y23y224x3x x23x2x324x26x2242x2()()()(()(3x)()114x3y3y x x y5x25a a4b6c3()()()(2c2b2632)12127a a b2a b2282-[2x+3y-3x-()()()()()()2y]232()()()()()()292m-3+m-3m-23034x-2y-3-y+8x.()()()()()()312x-3y+5x+4y328a-7b-4a-5b()()()()()()33a-2a+b+2a-2b3435x+4-3x-5()()()()()()358x-3y-4x+3y-z+2z36-5x2+5x-8x2--12x2+4x+2()[()]()[()]372-1+x+1+x+x2-x2383a2+a2-2a2-2a+3a-a2()()()()()()392a-3b+4a-3a-b403b-2c--4a+c+3b+c()()()()41x-3x-2+2x-3423a2+a-5-4-a+7a2()()()()()43x2+-3x-2y+144x-x2-x3+1()()()()()()453a+4b-2b+4a462x-3y-34x-2y()()()()()()472x-3y+5x+4y488a-7b-4a-5b()()()()()()49a-2a+b+2a-2b5035x+4-3x-5()()()()()()518x-3y-4x+3y-z+2z52-5x2+5x-8x2--12x2+4x+2532-1+x+1+x+x2-x2543a2+a2-2a2-2a+3a-a2()+(--)()-(-+)()+(+)()(-)-(-)555a3x3y4a563x4y2x1()-+[-(-)]()--[-+(+)]+577a3a3b58x2y242x23y()[()]()()()592a3b4a3ab603b2c4a c3b c()()()61x+x+-2x-4y62a+4b-3a-6b()633x-1-2x-5+3x-x64-
0.8ab-6ab-
1.2ab+5ab+ab652a21ab3a2()++(-)()-(-+)ab b2666x2y+2xy-3x2y2-7x-5yx-4y2x2-6x2y32422222()+(+)()(-)-(-)678x2y25x2y683a4b2a1()-+(-)()()()697m3m2n70x2y242x23y2()()()()()()714x31x27252x-7y-34x-10y3()()()()()()732x5y3x5y174227x36x5753a22ab23ab b2761231x2x y2x y2()()()()2323求下列代数式的值,其中,1773x[5x42x1]782xy-{5x-3[xy-x y+1]-4xy}
3、如果关于字母的代数的值与的取值无关,求、的
2.3m2n-mn2-
1.2mn+mn2-
0.8mn-3m2n m=6n=2值3x-3x2+mx+nx2-x+10x mn、已知,,求的值.()()、已知(),求()42x2+xy=103y2+2xy=64x2+8xy+9y
2.、化简求值x y23y x5|x-y-3|+a+b+4=02a2b ab2()-+-(-)-,=-
6.()--(-),其中=-,=15a32a2a2a33a21a
1.已知+=,+=,求++的值24a2b[3ab223a2b1]a
0.1b1已知+=+,+=,求-的值
7.x2xy2y2xy5x22xy y
2.已知,,求()()的值
8.ab3x2x bc x2a c.先化简,再求值
9.x+y=6xy=-45x-4y-3xy-8x-y+2xy()()()其中,
10.()---(-)-,其中-,113121x2x y2x y2x2y2323311127x2y xy[3x2y24xy2xy]4x2y x=y=222()已知与互为相反数,求代数式()()()()()()的32x x y4值3x y5x y23x yyx24xy23yx、已知与是同类项,求代数式()的值113x4my x4y3n m1003n99mn求代数式-(+)+(+)-(-)(其中-)的值化简求值
12.2x245x
10.54x22x x=2()+-(-),其中-
13.,()()(),其中;()(19x6x2x22xx=23)(),其中11b=-.2223a2-22a2+a+2a2-3a a=-239a2-把多项式写成两个整式的和,使其中一个只含次项12ab+5b2-7a2+12ab+7b2a=把多项式分成两组,两个括号间用-号连接,并且使第一
14.x5-3x3y2-3y2+3x2-y
55.个括号内含项
15.3x2-2xy-y2-x+3y-5“”已知,,分别求下列各式的值()()x.先化简下列各式,再求值
16.x2-xy=8xy-y2=31x2-y22x2-2xy+y2()()(),其中
17.,13a2b-{2a2b+[9a2b-6a2b+4a2]-3a2b-8a2}a1b()已知,,求当时,的值
3.22a=2a2-ab=-5a+1a13a-2b+
1.2。