如图所示，图片需要审核，稍等
a = 1/(2+√3) = 2-√3b = 1/(2-√3) = 2+√3a+1 = 3-√31/(a+1) = 1/(3-√3) = (3+√3)/6b+1 = 3+√31/(b+1) = (3-√3)/6 1/(a+1)² + 1/(b+1)²= [(3+√3)²+(3-√3)²] / 6²= 2×(3²+(√3)²) / 36= 2/3
