一大题:已知a^x=2,a^y=3,求(1)a^2x=y;(2)a^x-3y 计算题:(1).y·y^m+1·y^m-1-y^2m+1(写过程(2).(3x-y)^2-(3x+y)(3x-y)
问题描述:
一大题:已知a^x=2,a^y=3,求(1)a^2x=y;(2)a^x-3y 计算题:(1).y·y^m+1·y^m-1-y^2m+1(写过程
(2).(3x-y)^2-(3x+y)(3x-y)
答
(1)a^2x+y=(a^x)²a^y=2²*3=12(2)a^x-3y =a^x/(a^y)³=2/3³=2/27(1)y·y^m+1·y^m-1-y^2m+1=y^m+2+y^m-1-y^2m+1=y^m(y²-1/y-y^m+1)(2).(3x-y)^2-(3x+y)(3x-y)=(3x-y)(3x-y-3x-y)=...