苏科版七年级下第8章第1课时同底数幂的乘法课文练习含答案
【基础巩固】
1.下列各式中,正确的是 ( )
A.m4.m4=m8 B.a5.a5=a25 C.x3.x3=2x9 D.y6.y6=2y12
2.a5可以等于 ( )
A.(-a)2.(-a)3 B.(-a).(-a)4 C.(-a2).a3 D.(-a3).(-a2)
3. (2012.泸州)计算x2.x3=_______.
4.(1)①a4.a3=_______,②b2.(-b6)=_______,③(-3)7.(-3)8=_______;
(2)①xn-1.x3=_______,②xn.x2.x3-2n=_______,③ym+n.ym-n=_______;
(3)①(-a)3.(-a4)=_______,②(-5)7.(-54).(-5)2=_______;
(4)①(a-b)2.(a-b)3=_______,②(2m-n)3.(n-2m)4=_______
5.(1)①x2.( )=x6,②a7.a( )=a11,③an.a.a( )=a2n;
(2)若4x=5,4y=3,则4x+y=_______;
(3)若101012·10m·10n=102012,则m+n=_______.