问几个问题：m-n=6,mn=2,则(m+3)(n-3)= (-2)^2011*(-1/2)^2012= a大于0,a^x=2,a^y=5,则a^2x-2y=

题目

问几个问题：m-n=6,mn=2,则(m+3)(n-3)= (-2)^2011*(-1/2)^2012= a大于0,a^x=2,a^y=5,则a^2x-2y=
(2x-y-3z)(-2x-y+3x)
(a-b-c)^2-(a+b-c)^2
6*(7+1)*(7^2+1)*(7^4+1)*(7^8+1)+1

答案

m-n=6,mn=2,(m+3)(n-3)=mn-3m+3n-9=mn-3(m-n)-9=2-3*6-9=-25(-2)^2011*(-1/2)^2012=(-2)^2011*(-1/2)^2012*(-1/2)=[(-2)*(-1/2)^]2011*(-1/2)=2^2011*(-1/2)=-1/2a^x=2,a^y=5a^(2x-2y)=a^2x/a^2y=(a^x)^2/(a^y)^2=2^...