湘教版八年级上册数学第1章1.3.1同底数幂的除法学法大视野答案
1课前预习答案
1、不变;相减
2、am-n;≠0
2课堂探究例1思路导引答案
1、单项式多项式
2、(x-2y)2
解:(1)a⁶÷a2 =a6-2 =a⁴
(2)(-b)⁸÷(-b)=(-b)8-1=(-b)⁷=-b⁷
(3)(ab)⁴÷(ab)2=(ab)4-2=(ab)2 =a2b2
(4)(x-2y)⁴÷(2y -x)2÷(x-2y)
=(x-2y)⁴÷(x-2y)2÷(x-2y)
=(x- 2y)⁴-2-1
=x-2y
3课堂探究例1变式训练1-1答案
B
4课堂探究例1变式训练1-2答案
解:(1)
(2)原式=(x- 2y)3÷(x-2y)2 =x-2y
(3)原式=(a-b)3÷[-(a-b)]
= -(a-b)3-1
=-(a-b)2
5课堂探究例2思路导引答案
1、am/an
2、(am)3
解:(1)am-n= am/an=3/5
(2)a3m-2n
=a3m/a2n
=(am)3/(an)2
=33/52
=27/25