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1、精选优质文档-倾情为你奉上 幂的运算专项练习50题(有答案)专心-专注-专业12. (4ab2)2×(a2b)33(1);(2) (3x3)2(x);(3) m27mp2÷(7mp);(4) (2a3)(3a+1)4已知ax=2,ay=3求:ax+y与a2xy的值5已知3m=x,3n=y,用x,y表示33m+2n6若a=255,b=344,c=433,d=522,试比较a,b,c,d的大小7计算:(2 m2)3+m7÷m8计算:(2m2n3)3(mn2)29计算:10()2÷(2)3+2×()011已知:2x=4y+1,27y=3x1,求xy的
2、值12若2x+5y3=0,求4x32y的值13已知3×9m×27m=316,求m的值14若(anbmb)3=a9b15,求2m+n的值15计算:(x2x3)2÷x616计算:(a2n)2÷a3n+2a217若am=8,an=,试求a2m3n的值18已知9n+132n=72,求n的值19已知xm=3,xn=5,求x2m+n的值20已知3m=6,9n=2,求32m4n+1的值21(xy)5(yx)43(用幂的形式表示)22若xm+2n=16,xn=2,(x0),求xm+n,xmn的值23计算:(5a3b4)2(a2b)224已知:3m9m27m81m=330
3、,求m的值25已知x6bx2b+1=x11,且ya1y4b=y5,求a+b的值26若2x+3y4=0,求9x127y27计算:(3a2x4)3(2a3x6)228计算:29已知16m=4×22n2,27n=9×3m+3,求(nm)2010的值30已知162×43×26=22m2,(102)n=1012求m+n的值31(a)5(a3)4÷(a)232(a2b1)3(2ab2)233已知xa+bx2ba=x9,求(3)b+(3)3的值34a4a4+(a2)4(3x4)235已知(x5m+ny2mn)3=x6y15,求nm的值36已知am=2,an=
4、7,求a3m+2na2n3m的值37计算:(3x2n+2yn)3÷(x3y)2n38计算:(x2y3)1(x2y3)239 已知a2m=2,b3n=3,求(a3m)2(b2n)3+a2mb3n的值40已知n为正整数,且x3n=7,求(3x2n)34(x2)3n的值41若n为正整数,且x2n=5,求(3x3n)234(x2)3n的值42计算:(a2b6)n+5(anb3n)23(ab3)2n4344计算:an5(an+1b3m2)2+(an1bm2)3(b3m+2)45已知xa=2,xb=6(1)求xab的值(2)求x2ab的值46 已知2a27b37c=1998,其中a,b,c为整数
5、, 求(abc)1998的值47(0.25)1998×(4)199948(1)(2a+b)2n+1(2a+b)3(2a+b)n4 (2)(xy)2(yx)549.(1)(3x2y2z1)2(5xy2z3)2 (2)(4x2yz1)2(2xyz)4÷(yz3)250计算下列各式,并把结果化为正整数指数幂的形式(1)a2b3(2a1b3);(2) (a2)3(bc1)3;(3)2(2ab2c3)2÷(ab)2幂的运算50题参考答案:1解:原式=414=1;2. 原式=16a2b4×(a6b3)=2a8b73解:(1)原式=(5)×3=15;(2)原
6、式=9x6(x)=9x7;(3)原式=7m3p2÷(7mp)=m2p;(4)原式=6a2+2a9a3=6a27a3故答案为15、9x7、m2p、6a27a34解:ax+y=axay=2×3=6; a2xy=a2x÷ay=22÷3=5解:原式=33m×32n,=(3m)3×(3n)2,=x3y26解:a=(25)11=3211;b=(34)11=8111;c=(43)11=4811;d=(52)11=2511;可见,bcad7解:(2m2)3+m7÷m,=(2)3×(m2)3+m6,=8m6+m6,=7m68解:(2
7、m2n3)3(mn2)2=8m6n9m2n4=9解:原式=(4)+4×1=010解:原式=÷()+2×1=2+2=011解:2x=4y+1,2x=22y+2,x=2y+2 又27y=3x1,33y=3x1,3y=x1联立组成方程组并求解得,xy=312解:4x32y=22x25y=22x+5y2x+5y3=0,即2x+5y=3,原式=23=813解:3×9m×27m,=3×32m×33m,=31+5m,31+5m=316,1+5m=16,解得m=314解:(anbmb)3=(an)3(bm)3b3=a3nb3m+3,3n=9
8、,3m+3=15,解得:m=4,n=3,2m+n=27=12815解:原式=(x5)2÷x6=x10÷x6=x106=x416解:(a2n)2÷a3n+2a2=a4n÷a 3n+2a2=a4n3n2a2=a n2a2=an2+2=an17解:a2m3n=(am)2÷(an)3,am=8,an=,原式=64÷=512故答案为51218解:9n+132n=9n+19n=9n(91)=9n×8,而72=9×8,当9n+132n=72时,9n×8=9×8,9n=9,n=119解:原式=(xm)2xn=3
9、2×5=9×5=4520解:由题意得,9n=32n=2,32m=62=36,故32m4n+1=32m×3÷34n=36×3÷4=2721解:(xy)5(yx)43=(xy)5(xy)43=(xy)5(xy)12=(xy)1722解:xm+2n=16,xn=2,xm+2n÷xn=xm+n=16÷2=8,xm+2n÷x3n=xmn=16÷23=223解:(5a3b4)2(a2b)2=25a6b8a4b2=25a10b6=24解:由题意知,3m9m27m81m,=3m32m33m34m,=3m+2m+
10、3m+4m,=330,m+2m+3m+4m=30,整理,得10m=30,解得m=325解:x6bx2b+1=x11,且ya1y4b=y5,解得:,则a+b=1026解:2x+3y4=0,2x+3y=4,9x127y=32x233y=32x+3y2=32=927解:(3a2x4)3(2a3x6)2=27a6x124a6x12=23a6x1228解:原式=a2b3=29解:16m=4×22n2,(24)m=22×22n2,24m=22n2+2,2n2+2=4m,n=2m,(33)n27n=9×3m+3,(33)n=32×3m+3,33n=3m+5,3n=m+
11、5,由得:解得:m=1,n=2,(nm)2010=(21)2010=130解:162×43×26=28×26×26=220=22m2,(102)n=102n=10122m2=20,2n=12,解得:m=11,n=6,m+n=11+6=1731原式=(a)5a12÷(a)2=a5+12÷(a)2=a17÷a2=a1532解:(a2b1)3(2ab2)2=(a6b3)(a2b4)=a4b1=33解:xa+bx2ba=x9,a+b+2ba=9,解得:b=3,(3)b+(3)3=(3)3+(3)3=2×(3)3=2
12、5;(27)=5434解:原式=a8+a89x8,=2a89x835解:(x5m+ny2mn)3=x15m+3ny6m3n,(x5m+ny2mn)3=x6y15,解得:,则nm=(9)3=24336解:am=2,an=7,a3m+2na2n3m=(am)3(an)2(an)2÷(am)3=8×4949÷8=37解:(3x2n+2yn)3÷(x3y)2n,=27x6n+6y3n÷(x3y)2n,=27x6n+6y3n÷x6ny2n,=27x6yn38解:(x2y3)1(x2y3)2,=x2y3x4y6,=x6y3,=39解:(a3m)2
13、(b2n)3+a2mb3n,=(a2m)3(b3n)2+a2mb3n,=2332+2×3,=540解:原式=27x6n4x6n=23x6n=23(x3n)2=23×7×7=112741解:x2n=5,(3x3n)234(x2)3n=9x6n34x6n=25(x2n)3=25×53=312542解:原式=a2nb6n+5a2nb6n3(a2b6)n=6a2nb6n3a2nb6n=3a2nb6n43解:原式=()50x50()50x100=x15044解:原式=an5(a2n+2b6m4)+a3n3b3m6(b3m+2),=a3n3b6m4+a3n3(b6m
14、4),=a3n3b6m4a3n3b6m4,=045解:(1)xa=2,xb=6,xab=xa÷xb=2÷6=;(2)xa=2,xb=6,x2ab=(xa)2÷xb=22÷6=46解:2a33b37c=2×33×37,a=1,b=1,c=1,原式=(111)1998=147解:原式=()1998×(4)1998×(4),=()1998×41998×(4),=(×4)1998×(4),=1×(4),=448解:(1)原式=(2a+b)(2n+1)+3+(n4)=(2a+b)3n;(2)原式=(xy)2(xy)5=(xy)749解:(1)原式=()2()2=;(2)原式=÷=y2z6=150解:(1)a2b3(2a1b3)=2a21b3+3=2ab6;(2)(a2)3(bc1)3,=a6b3c3,=;(3)2(2ab2c3)2÷(ab)2,=2(4a2b4c6)÷(a2b2),=8a4b6c6,=