若2m+3n=5,求4^m*8^n的值
问题描述:
若2m+3n=5,求4^m*8^n的值
答
4^m*8^n
=2^2m*2^3n
=2^(2m+3n)
=2^5
=321/4^2006*2^4010 ,会吗?要过程1/4^2006*2^4010=1/4*1/4^2005*4^2005=1/4*(1/4*4)^2005=1/4*1=1/4谢谢,但我这一方面不怎么好,还有一题,谢谢2(x^3)^2*x^3-(3x^3)^3+(5x)^2*x^72(x^3)^2*x^3-(3x^3)^3+(5x)^2*x^7=2x^9-27x^9+25x^9=0