计算3上面-1+2cos60°-根号3/3 tan30°-tan45°=
问题描述:
计算3上面-1+2cos60°-根号3/3 tan30°-tan45°=
答
(-1+2×1/2-√3)/(3×√3/3-1)
=-√3/(√3-1)
=-√3(√3+1)/(√3+1)(√3-1)
=(-3-√3)/2