9,第一章 整 式,整式的除法(1),(a 0),1、用字母表示幂的运算性质:,1,(5) (a2)3 (-a3 )(a3)5 ; (6) (x4)6 (x6)2 (-x4 )2 。,= a10,= an,= c2,=a9 a15,=a6,=,=x24x12 x8,=x 24 12+8,=x20.,类 比 探 索,计算下列各题, 并说说你的理由: (1) (x5y) x2 ; (2) (8m2n2) (2m2n) ; (3) (a4b2c)(3a2b) .,解:(1) (x5y)6x2 = x30y6x2,把除法式子写成分数形式,,=,把幂写成乘积形式,,约分。,=,= xxxy,= x3y ;,省略分数及其运算, 上述过程相当于:,(1)(x5y) x2 =(x5x2 )y =x 5 2 y,(2) (8m2n2) (2m2n) =,=(82 )m 2 2n2 1,(82 )(m2m2 )(n2n ),探 索,(1)(x5y) x2 =(x5x2 )y =x 5 2 y,观察、归纳,(1) (x5y) x2 = x5 2 y (2) (8m2n2) (2m2n) = (82 )m2