2sin30°·cos45°-(sin60°)负二次方+根号3tan30°
问题描述：
2sin30°·cos45°-(sin60°)负二次方+根号3tan30°
答
=2×1/2×√2/2-(2/√3)²+√3×√3/3
=√2/2-4/3+1
=√2/2-1/3