七上計(jì)算：合并同類項(xiàng)50題含答案

1、合弁同類項(xiàng)50題（一）1.5a2b7a9b_222. 3x4y6y2x.223.7x5x32x6x8.12.4.5ab-a-b.2332,2,836.3a6ab4aba92_,27. 3xy2y5xy4y22_8. 6a7a65a9a81,22,3225ab5ab-ab0.75ab44_2_42_10.2x3x4x6x522_2.29.4a3b2ab2a4bab.第1頁（共12頁）2211. x2xy2x3xy2212. 6a7b94ab613. 7ab2a2b.2222143y3x2xy2x4y222216.4ab3ab3ab5ab_2215.3x2xy4y3xy3y2x/rc22c2r21

2、7. 3xy5xy6xy7xy_2_218. 7a4a2a3a3193a24a5一一一32_3320.3x5xx42x2xx第2頁（共12頁）21.22mn33-122nm1772mn2nm23.3(x22x4)2(2x15x)225.a2(5a3b)3(a3b)27.3(2xy)2(4x2y)2009.23_3.八222.xyx5x72xy21224.2(x2y)-(6x12y)10.-2_26.3(m2n)28.(ab)(4a3bc)(5a3bc).29.229m4(2m3mnn2)2、30.2(xy2x)一22(3xxy).第3頁（共12頁）_2.2、，2一2.、31.5(3abab)(

3、ab3ab)12232x27x(4x3)3x222233.(2a4a)(5aa1)234.m2(mn4n)8n.2235.4abab2(2ab3ab1)1136.6(-x1)(2x1)2337.xy5(2xz)2y-2_238.4x(32xx)(2x1).39.3(3x4)_2_240.(2a12a)(a1a)第4頁（共12頁）41,4x3x3(42x)842.43.2a(ab)2(ab)44.322345.4(a3b)(2b5a)46._2,_21247.3a2(5a4a2)6a-a248.22_249.3(a2ab)2(3abb)50.223(ab2b)2(ab3b)22222(3abab

4、)(5abab)13(x1)(x5)2_2(6a2a1)2(34a2a)12已知Ax3,Bqx23x1,求A2B的值.第5頁（共12頁）合弁同類項(xiàng)50題（一）參考答案與試題解析1 .計(jì)算：5a2b7a9b【解答】解：5a2b7a9b(5a7a)(2b9b)2a7b.一一222 .化簡：3x4y6y2x.【解答】解：原式3x24y6y2x22_2(3x2x)(4y6y)_2_-一-2_3.7x5x32x6x8【解答】解：原式x23x5.4.5ab2a2b.3【解答】解：原式12(5a2a)(b3b)ii一a215.-ab4225ab32,-,2-ab0.75ab41cc【解答】解：原式(-ab2

5、0.75ab2)4J232人ab-ab432,2,836.3a6ab4aba9232(5a2b-a2b)4【解答】解：3a36a2b4a2b8a393832,2,、(3aa)(6ab4ab)9193一a92a2b.227,化簡：3xy2y5xy4y【解答】解：3xy2y25xy4y2第6頁（共12頁）_、一2.2、(3xy5xy)(2y4y)22xy6y.228 .化簡：6a7a65a9a8【解答】解：原式(6a5a)(7a29a2)(68)22aa14.22229 .合并同類項(xiàng)：4a3b2ab2a4bab.【解答】解：4a23b22ab2a24b2ab2222(4a2a)(3b4b)(2ab

6、ab)_222a7bab.“一一一2210 .合并同類項(xiàng)：2x3x4x6x5【解答】解：原式(2x24x2)(3x6x)56x29x5.2211 .化間：x2xy2x3xy【解答】解：原式x22x22xy3xy22(x2x)(2xy3xy)2xxy.2212 .6a7b94ab6【解答】解：原式(6a4a)(7b2b2)(96)210a6b3.13 .化簡：7ab2a2b.【解答】解：7ab2a2b(72)a(12)b5ab.222214 .合并同類項(xiàng)：3y3x2xy2x4y.【解答】解：原式(32)x22xy(34)y2第7頁（共12頁）22xyy_222-215 .3x2xy4y3xy3y

7、2x【解答】解：原式(32)x2(23)xy(43)y2x2xyy2.222216 .4ab3ab3ab5ab【解答】解：原式4ab23ab23a2b5a2b_.2_2.7ab8ab.22_2217 .化間：3xy5xy6xy7xy【解答】解：原式22(37)xy(65)xy/24xy2218 .7a4a2a3a3【解答】解：原式,一、，22、(7a2a)(4a3a)325a7a3.19 .計(jì)算；3a24a5.【解答】解：3a24a5(3a4a)(25)a3.323320.3x5xx42x2xx9【解答】解：3x35x2x42x32xx393332(3x2xx)5x(2xx)(49)5x2x1

8、3.-2232172221mn-nmmnnm326【解答】解：原式(23"1)mn232682一mn.32332233xy2x2.22 .xyx5x72xy【解答】解：x2yx35x372x2y2_2123 .去括號，合并同類項(xiàng)：3（x22x4）2（x25x萬）.第8頁（共12頁）【解答】解：原式3x26x122x210x15x216x11.2_1_2-24 .先去括號，再合并同類項(xiàng)：2(x22y)-(6x212y)10.2【解答】解：2(x22y)1(6x212y)102222x4y3x6y1025 .去括號，合并同類項(xiàng)：a2(5a3b)3(a3b)【解答】解：a2(5a3b)3(

9、a3b)a10a6b3a9b8a3b.226 .化簡：3(m2n)【解答】解：原式3m26n.127 .去括號，并合并同類項(xiàng)：3(2xy)2(4x-y)2009.1【斛答】斛：3(2xy)2(4x當(dāng)20096x3y8xy200914x2y2009.28 .去括號，合并同類項(xiàng)：(ab)(4a3bc)(5a3bc).【解答】解：原式ab4a3bc5a3bc2a5b.29.計(jì)算:_22_2.29m4(2m3mnn)4n.【解答】解：原式9m28m212mn4n24n22m12mn.2122230 .化簡：2(xy-x)(3xxy).2【解答】解：原式2x2yx23x2x2y223xy2x.22223

10、1.化簡：5(3abab)(ab3ab)【解答】解：原式15a2b5ab2ab23a2b2. _212ab6ab.1 232.計(jì)算：x27x(4x3)3x22第9頁(共12頁)【解答】解：原式lx27x(4x3)3x22122x7x4x33x272x3x3.22233 .計(jì)算：(2a4a)(5aa1)【解答】解：原式2a24a5a2a1,_2_6a5a3.234 .化間：m2(mn4n)8n.【解答】解：原式m22mn8n8n2m2mn.35.計(jì)算:2_24abab2(2ab3ab1).【解答】解：原式24abab24ab6ab25ab2.1 136. 6(-x1)(2x1)2 321【解答】

11、解：原式3x6-x-33719一x.3 337. xy5(2xz)2y【解答】解：原式x(y10x5z2y),xy10x5z2y,11xy5z.2238. 化簡：4x(32xx)(2x1).【解答】解：原式2一2,4x32xx2x1,2_2x2x4x2x31,39. 3(3x4)【解答】解：3(3x4)9x12.40.化簡:_2_2(2a12a)(a1a)第10頁(共12頁)【解答】解:原式2a212aa141.4x3x3(42x)8【解答】解:原式4x3x9(42x)244x3x3618x2417x12.242.化簡：3(ab2b)2(a2b3b)【解答】解：原式23ab6b22ab6b2-ab12b.43.化簡：2a(ab)2(ab)【解答】解:原式2ab2a2b-244.2(3abab2)(5ab2a2b)【解答】解:原式6a2b2ab25aba2b1225ab7ab1345.化間：4(a3b2)2b25a3)【解答】解：原式34a212b22b35a32a10b.46.化簡：3(x1)(x5)【解答】解：原式3x2247.計(jì)算：3a(5a4a)6a【解答】解：原式3a25a4a26a12-a2，-248.化簡：（6