6.simplify the following expressions,and express ur ans. in positive indices
(a)a^-7*a^-3
(b)a^3/a^-5
(c)a^-8*a^-2*a^4
(d)a^-1/a^-3*a^8
maths(X marks)
2010-11-01 4:34 am
回答 (1)
2010-11-01 4:38 am
✔ 最佳答案
(a)a^-7*a^-3=a^-7+(-3)
=a^-10
=1/a^10
(b)a^3/a^-5
=a^3-(-5)
=a^8
(c)a^-8*a^-2*a^4
=a^-8+(-2)+4
=a^-6
=1/a^6
(d)a^-1/a^-3*a^8
=a^-1-(-3)-8
=a^-7
=1/a^7
收錄日期: 2021-04-23 19:23:40
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