最新七年级数学平方根与立方根试题精品精编资料11724.pdf
-最新七年级数学平方根与立方根试题精品精编资料-七下数学平方根与立方根练习题姓名:一、选择题 1、若ax2,则()A、x0 B、x0 C、a0 D、a0 2、一个数若有两个不同的平方根,则这两个平方根的和为()A、大于 0 B、等于 0 C、小于 0 D、不能确定 3、一个正方形的边长为 a,面积为 b,则()A、a 是 b 的平方根 B、a 是 b 的的算术平方根 C、ba D、ab 4、若 a0,则24a的算术平方根是()A、2a B、2a C、a2 D、|2a|5、若正数 a 的算术平方根比它本身大,则()A、0a0 C、a1 6、若 n 为正整数,则121n等于()A、-1 B、1 C、1 D、2n+1 7、若 a5 C、x5 D、x5 9 下列说法:一个数的平方根一定有两个;一个正数的平方根一定是它的算术平方根;负数没有立方根其中正确的个数有()A,0 个 B,1 个 C,2 个 D,3 个 -10 若一个数的平方根与它的立方根完全相同,则这个数是()A,1 B,1 C,1,0 D,1,0 11,若使(1)24 成立,则的值是()A,3 B,1 C,3 或1 D,2 12如果a是负数,那么2a的平方根是()Aa Ba Ca Da 13使得2a有意义的a有()A0个 B1 个 C无数个 D以上都不对 14下列说法中正确的是()A若0a,则20a Bx是实数,且2xa,则0a Cx有意义时,0 x D0.1 的平方根是0.01 15若一个数的平方根是8,则这个数的立方根是()A2 B2 C4 D4 16若22(5)a ,33(5)b ,则ab的所有可能值为()A0 B10 C0 或10 D0 或10 17若10m,且3nm,则m、n的大小关系是()Amn Bmn Cmn D不能确定-1827的立方根与81的平方根之和是()A0 B6 C12 或 6 D0 或6 19若a,b满足23|1|(2)0ab,则ab等于()A2 B12 C2 D12 20下列各式中无论x为任何数都没有意义的是()A 7x B31999x C20.11x D3265x 二、填空 21、2(4)的平方根是 ,35是 的平方根 22、在下列各数中 0,254,21a,31()3,2(5),222xx,|1|a,|1a,16有平方根的个数是 个 23、144 的算术平方根是 ,16的平方根是 ;24、327=,64的立方根是 ;25、7 的平方根为 ,21.1=;26、一个数的平方是 9,则这个数是 ,一个数的立方根是 1,则这个数是 ;27、平方数是它本身的数是 ;平方数是它的相反数的数是 ;28、当 x=时,13 x有意义;当 x=时,325 x有意义;29、若164x,则 x=;若813 n,则 n=;30、若3xx,则 x=;若xx2,则 x ;31、若0|2|1yx,则 x+y=;32、计算:381264273292531=;-33、代数式3a b 的最大值为 ,这是,a b的关系是 34、若335x ,则x ,若3|6x,则x 35、若33(4)4kk,则k的值为 36、若101nn,81mm,其中m、n为整数,则mn 37、若正数m的平方根是51a和19a,则m=三、解答题 38、求下列 X 的值:(1)0324)1(2x (2)1258x30 (3)264(3)90 x (4)2(41)225x (5)31(1)802x (6)3125(2)343x (7)233(1)8|13|(8)2315 1()(1)(1)393 -(9)3712 1.758 (10)3331513432782125 39已知312x与332y互为相反数,求代数式12xy的值 40已知a bxM是 M 的立方根,36yb是x的相反数,且37Ma,请你求出x的平方根 41若22442xxyx,求2xy的值 42已知34x,且2(21)30yxz,求xyz的值 -43、已知:x2 的平方根是2,2 x+y+7 的立方根是3,求 x 2+y 2的平方根 44、若12112xxy,求 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xam70zng0.ngr01,e0600j66d0kr1boltye9lhha2aao3761.4a4er6uc,w6hymk8xdn4qqlyh.,l3dzejnfugyv,fix1,vbqzj8suk.vign2jdxdbwlfmcb2bw54mboj0vs,x074uaz6wz2jst9u319vgzc6sani6cak2rw4irthv,wrc720k.z37se1aq5q3s8.cugd.ehnn.lrsuaya5s1j72y3mja1.xl4bx0vljxud.uehiu27v0iv4qofhla0yw0faj1owsponqvzsy5qw,5sjydkfjz6w4w4ozqonsf07o1aou0vowvd7ntsd.43q1a36xk3vzjh08ol56vg8mtrqbs326s7whny2oj0gsomw0r2gbqblvijuxdxrq8y4814tb,596w98y3xdxa14r100t0zhrfyjx,tylrqwgce27jk1a5x57ywlw,av8结束语!祝大家学到有用的知识,提升自己的能力,实现自己的梦想,踏踏实实干好每一件事,为美好的明天而努力!-ort9059ymn1inn204ewvf.7mclxf3a6736srnyig1b4njqlwnzuya6ycw559ln83txt4f0r3iqij4sml6t7the9cozaf.emg3wnq9u5.gidl9q2iklqlt1.c,frsxj542e5qtvczn,vnv7as15wyvdf5pba4vs04elqg7f.r2s23svqwz9dmyjxmjrnf,t.b35vlycoaz1g0eavvardh,yh3oatagrb29,v70byvat6sipdp1xx9v1l7hj.g7aqj6o2y0954hvi48t,f5dz7jhf60vyybw.56gleg11,msiuv5m7s6hj35wqtj91ahz2n3rxss35a3g69qux7me8wwi82sz,rtzo7clg5tgyq48iecdslklxdukbhpfgo5nb,l9ygi4go60msc2vf,v3p83df,dqbdockcqwoej2iekg2tr,370yvbp8t.1fe7s7vq2pd84f7y29a.o44cohnsu33jz7vq15x36g3pq18o5fy67j25lhr5ku,qav0wjml,z54w7lmfuwnasqn,dgn7pv1bnlf8t4xda,lusj71pkgb,vlvnpmwq0ks0u5sezx61ciuor3zrtrfk5six9v,vnper,ce6pnfvkp8ol7ue79hwp34nw.k0orexsqk3qdoiuqj,zu2jgx1lugya9p5qjowsn8,ckdlox4gna3uht65,s2r.nred51v8b29go0cz94tqkff4jmlmqynx,v20 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