幂的乘方与积的乘方习题精选典型例题
《幂的乘方与积的乘方》习题精选、典型例题 习题精选 选择题: 3224 ) .计算(a)+a?a的结果等于( 1126896 aD.a+a A.2a B.2a C. ) .下列等式一定成立的有( 22m2mm2m2 ;; ①x = (x) ②x = (?x) m2m2m2m2 x?) ④x = ( ③(x) = x; 个2个 D.1 A.4个 B.3个 C.5522 ) 3.化简(?a)+(?a)的结果为( 10710 A.?2a B.0 ?2a D. C.2a n+3n+2) 81的计算结果为( . 4n为正整数时,3?3n+55n+142n+55n+12 3 DC.3. B.3 A.3 22 5.计算(?2a)的结果是( ) 4444 D.?4a.?2a C.4a 2a A. B362 ) .计算a(ab)等于( 6121431311123b D.3a.ab Bab C.ab A . ) 7.下列运算不正确的是( 25542363552103 b = bD... A(a) = a Bb?b = b C(2ab) = 8ab .b? ) 8.下列计算过程正确的是( 933+3633×333 B. = x = xx?x +x A.x = x = x 52+32353+583 C.x?x?x = x = x D.x?(?x) = ?x = ?x 解答题: xx+1 = 31.解方程:9 335544 3、4、5的大小 2.比较32n+12) (nx)??(?x) 为正整数?x 3 .计算:(333 ))×?9)×(?(?( 4.用简便方法计算:22222423x? )(y)+(2xy2x5 .计算:yn324nn2n )b(2)(a;(1)(ab),求: = 3b, = 5a.如果6 答案: 选择题:1.B 2.B 3.B 4.C 5.C 6.B 7.D 8.D 4455332n+624(2)135 .(1)2025;5.?x3xy;6;4.?8; 解答题:1.x = 1;2.4>3>5;3.典型例题 1.下列计算正确的是( ) 33 333235 2n2nn bb) = a(2xy) = 6x A.(xy) = xyy C.(?3x) = 27xD.(aB.D 答案: 633333323323333C?27x, = (?3)(x) = ?(xy) 说明: = xy,A错;(2xy) = 2xy = 8xy,B错;(3x)nn2nn2n2 D. = ab,D正确,答案为错;(ab) = (a)b ) 2.下列各式错误的是( 3324 48 222 3412 (3ab) = 6ab = ? 8a A .(2) = 2 C.(2mn) = 16mnD..B(? 2a)C 答案: 233×41233343 B中式子正确;(3ab)a = ? 8a,2)?, 说明:(2) = 2 = 2A中式子正确;( 2a) = (?8442444222222 .D),a= 3b = 9abC中式子错误;(2mn = 2m(n) = 16mn,中式子正确,所以答案为C ) 3 ( .下列计算中,错误的是??22n2nn 22m 23n2n+13n+1 6m1 = ?C.(ab) = m = ab. Am·m9xB.(?aD) = a.(?3x) 答案:D ???n2n+1n+2n+13n+1m122(m1)2m22n (ab) = a,, 说明:m·m = m = mA中计算正确;(?aB) = a中计算正确;623n2nn2332n .27x,D中计算错误;所以答案为D(x= (a)b = ab,C中计算正确;(?3x) = (?3)) = ?623 ) ( 4.计算a(a)的结果等于 12 14 11 36 . A.aaDa C.aB. 答案:B 62362×3666+612 B.,所以答案为) 说明:a(a = a·a = a·a = a = a 5.下列各式计算中,正确的是( ) 336 54205315 236 a)] = a[(D]. (a A.) = a).B(?a = ?a C[(?a) = a.?D 答案: 15315×320×49×333355455,B= a,错;= ?a = (a)(a)[(?] = ??a) = )?错;,= a (a 说明:)= aA(a a63226×3 a)[(C错;?]D正确,答案为.D = a?a)? = ( = (a), ) ( .下列各式计算中,错误的是 64m2m22nn2 36 66 n22n )x? = (x.D)x? = (x.C ) = (a)(a.B = m)(m.A 答案:D 666×6364m4m2m24mn22n, = xx)?说明: (m) = m,,计算正确; = m,A(a) = a(a) = aB计算正确;(2nnn2n22n2C计算正确;当n为偶数时,(?x) = (x) = x;当n为奇数时,(?x) = ?x,所以D不正确,答案为D.