4.42÷(0.25×6.8)=( )
A:0.026
B:2.6
C:26
D:0.26
— Can you come to a party on Saturday, Peter?
— Oh, ______I'm already going out, I'm afraid.
如图,已知矩形ABCD,把矩形沿直线AC折叠,点B落在点E处,连接DE、BE,若△ABE是等边三角形,则S∆DCES∆ABE=____
已知sin(x+π6)=13,则sin(x-5π6)+sin2(π3-x)的值是____