这道题谁会啊?帮忙解一下,急用!谢谢大家了

2024-12-27 09:07:21
推荐回答(1个)
回答1:

21:解:x=2sin45°-√3tan30°
=√2-1
原式=1÷[(x²-1)/(x-1)]
=1÷[(x+1)(x-1)/(x-1)]
=1/(x+1)
=1/(√2-1+1)
=√2/2