计算:;
计算:(1)(2+1)(22+1)(24+1)+1(2)(3)解方程:(4)解方程:
计算: (1)3-7-(-7)+(-6); (2).
计算下列各式 (1) (2)
(每小题5分,本题满分20分)计算: (1) (2); (3) (4)
计算: (1)sin30°-cos45°+tan260° (2)