1/根号2-3tan²30°+π°+2根号(sin45°-1)² .
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1/根号2-3tan²30°+π°+2根号(sin45°-1)².1/根号2-3tan²30°+π°+2根号(sin45°-1)².1/根号2-3tan
1/根号2-3tan²30°+π°+2根号(sin45°-1)² .
1/根号2-3tan²30°+π°+2根号(sin45°-1)²
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1/根号2-3tan²30°+π°+2根号(sin45°-1)² .
1/根号2-3tan²30°+π°+2根号(sin45°-1)²
=√2/2-3*1/3+1+2*(1-√2/2)
=2-√2/2