A:fresh
B:full
C:new
D:young
全集U=R,集合A=x|x2-4≤0,集合B=x|2x-1>1,则A∩B=
求证:∠BAD=∠E
①x﹣ 13 =0.25
② 15 x﹣ 13 =120
③ x3 =50%