题目内容
计算。(10')
(1)2cos30°-tan60°+tan45°
(2)2sin60°-3tan30°+ ()+(-1)
(1)sin30°-cos45°+×-tan45°
(2)2sin30°·tan30°+cos60°·tan60°
计算。(10')(1)sin30°-cos45°+×-tan45° (2)2sin30°·tan30°+cos60°·tan60°