①1-根号3×cos30°+(1/2)^-3=
问题描述:
①1-根号3×cos30°+(1/2)^-3=
②分解x^2 y - y=
③反比例函数y=k/x的图像过(-3,2)则k=
答
①
1-√3*cos30°+(1/2)^(-3)
=1-√3*√3/2+8
=1-3/2+8
=15/2
②
x^2*y-y
=(x^2-1)y
=(x+1)(x-1)y
③
k=xy=-3*2=-6