计算下列各式,并把结果化为正整数指数幂的形式. (1)a2b3(2a-1b3); (2)(a-2)-3(bc-1)3; (3)2(2ab2c-3)2÷(ab)-2.
问题描述:
计算下列各式,并把结果化为正整数指数幂的形式.
(1)a2b3(2a-1b3);
(2)(a-2)-3(bc-1)3;
(3)2(2ab2c-3)2÷(ab)-2.
答
(1)a2b3(2a-1b3)=2a2-1b3+3=2ab6;
(2)(a-2)-3(bc-1)3,
=a6b3c-3,
=
;a6b3 c3
(3)2(2ab2c-3)2÷(ab)-2,
=2(4a2b4c-6)÷(a-2b-2),
=8a4b6c-6,
=
.8a4b6 c6