Question

X>1,Y>1,(log2下标X)*(log2下标Y)=1,则XY最小直是?

Answer 1

X>1,Y>1

log2下标X>0 log2下标Y>0

(log2下标X)+(log2下标Y)>=2*根号下[(log2下标X)*(log2下标Y)]=2

即log2下标(xy)>=2

xy>=2^2=4