第1页共5页七年级计算题专项练习题一、有理数四则计算1.6.32.5-3.4-4.15.1-2.75.143-5.221-3.)31-()21-(54)32(214.)215-(75.2414)5.1-(5.63-)5-(8-6.6.0-)9.4(-)65-()52-(7.5)4-(-)2-(-8)6-(8.)5-(22-5)2-(9.2)-3(-6)20-(-4)9-(10.)232-32(2121-11.)2323-(23-12.0)132(4154313.)763(12)763()7()763((-5)14.)1391613914()]4(41281[15.1361175413622723116.)02.0()5.2()8(17.)8(45)201(18.)34(8)53(-19.1631-)51-32(97-20.75)21(212)75-(-7521121.(-2))530.2-(1[-5-3-1122.)75607160-7360()127-21-53(23.)312()213-611324(212-24.56154213-3011209-12765-2325.)7.1-(5.2-)4.2-(5.23.75.2-二、解方程(1)152-xx(2)43214xx(3)xx5312452(4)15.43.5-2xx(5)x354x(6)5373yy(7)04)12(x(8)2)-(3-4x第2页共5页(9)x31)1(2)1(xx(10)3)1(6)2(2xx(11))12(3)21(10)1(4xxx(12))5.25.1(2)3()1-(2xxx(13)22)]2(49[2)7-(3xx(14))18(3)]2(2)1(3[23xxxx(15))6(2)1(4)3-(2xxx(16)xx322122)141(3223(17)xx232)31(423(18)3102x-3x(19)16231xxx(20)163xx(21)246231-xxx(22)1312xx(23)1424213xx(24)37524123yy(25)35.012.02xx三、整式的加减1.单项式32x4-y的系数是_______,次数是_______。2.单项式y2x32-的系数与次数之积为_______。3.若32nm2yx6与2x-y是同类项,则m+n=_______。4.单项式bca2-2的系数是_______。5.合并同类项:(1)3a-2b-5a+2b(2)(2m+3n-5)–(2m-n-5)(3)7x-y+5x-3y+3(4)22k4-k3)k-k(2(5)3ab-4ab+8ab-7ab+ab(6)3(x-y)-2(x+y)+2(7)4m2+5mn-2(m2+mn)(8)3ab-2b2-5ab+2b2(9))42(3)3x(22222yxxyxyy(10)2222)2(bbaa(11))3(2)12(622abaaba(12)y2-xy2-)x(2)x(22222yxxyy(13))3-x2x(-)x3-6-x5(2332(14))a4a-2()1-aa2(-)a3-a4(222(15)2222m2-)m-mn(-nm2-nm36.先化简,再求值:(1)32y,2-x其中),3123()31(2-x2122yxyx。第3页共5页(2)3-n,21-m,其中)nmn(2n2-m3-)mn2-m(322。(3)1a其中,)a2a4a-(5-)a43-a2a5(32332。(4)31-b,1a其中,)b-ab(2-)ba21-ab(2)b2-a(322233。7.若的值。baab,求0)1b(2-a3228.已知a、b互为相反数且a≠0,c、d互为倒数,m的绝对值是最小正整数,求cdbaba2018)(2017m的值。四、幂的乘方和积的乘方1.计算2.D2C.2-.B2-.A所得的结果是())2-()2-(9999991002.计当m是正整数时,下列等式成立的有()A.4个B.3个C.2个D.1个m2m22mm2m2m22mm2)a-(a)4;()a-(a)3;()a(a)2;()a(a)1(3.下列运算正确的是()33342223632y-x)y-x(.Dyx41)xy21-(C.y-9x)yx3-(.Bxy53yx2.A4.a与b互为相反数,且都不等于0,n为正整数,则下列各组中一定互为相反数的是()1-n21-n212n12n2nn2nb-与a.Db与C.ab与a.Bb与a.An5.下列等式中正确的个数是()A.0个B.1个C.2个D.3个655205-410361055222)4;(a)a-(a)3;()a(a)a-()a-)(2;(aaa)1(???6.计算:;_______)a-()a-)(2;(________xx)1(233232?7.综合计算:(1)322-2-2-)()()(??(2)2346)()(x-xxx???)((3)3443a-a-)()(?(4)aa4--23)(a(5)aaann??12(6)32)]([)(baba?(7)942753xxxxxx????(7)532)()(b-aabba??)((9)52)2(2y)-xxy?((10)32)()()(bacacbcba?(11)201820178-125.0)()(?(12)20172018513135(13)320202818.已知x+2y-5=0.求yx2133?的值。9.已知x+3y-4=0.求yx82?的值。10.若3344554,3,2cba,比较a、b、c的大小。第4页共5页11.已知2)2(与1ba互为相反数,求20162017)(aba12.若aM10)102)(105)(108(26,则M和a的值是多少?五、整式的乘除1.如果))((x2bxaxabkx,则k的值为____________.2.已知4823223,3bababa那么____________.3.23)()(mnnm____________.4.若?)(,27423mmmmmxxxxx则____________.5.如果代数式(ax-y)(x+y)的乘积中不含“xy”型的项,那么a的值是____________.6.计算:(1)22221(2)2ababc(2))1)(32(xx(3))2()246(22abababba(4)43)2()2()2(yxxyyx?(5))31)(32-)(3(22mnnmm)121)(2(22xxx(6))1(2)2(aaa(7))1)(3(...