同底数,不同指数幂加法法则5+5^2+5^3+5^4+5^5+5^6
问题描述:
同底数,不同指数幂加法法则
5+5^2+5^3+5^4+5^5+5^6
答
5+5^2+5^3+5^4+5^5+5^6
=(5-5*5^6)/(1-5)
=(5-5^7)/(-4)
=(5^7-5)/4
=19530