百度网友f7d02de2018-10-28知道合伙人教育行家关注（1）sin45°-cos60°+tan60°=√2/2-1/2+√3（2）cos230°+sin230°-tan45°=3/4+1/4-1=0（3）sin30°-tan30°+cos45°=1/2-√3/3+√2/2（4）cos30°-sin45°/sin60°-cos45°=√3/2-(√2/2)/(√3/2)-√2/2=√3/2-√6/3-√2/2（5）sin230°+2sin60°+tan45°-tan60°+cos230°=1/4+√3+1-√3+3/4=1+1=2