1<√3<2
[(1+2)/2]²=1.5²=2.25<3
[(1.5+2)/2]²=1.75²=3.0625>3
[(1.5+1.75)/2]²=1.625²=2.640625<3
[(1.625+1.75)/2]²=1.6875²=2.845969<3
[(1.6875+1.75)/2]²=1.71875²=2.9541015625<3
[(1.71875+1.75)/2]²=1.734375²=3.008056640625>3
[(1.71875+1.734375)/2]²=1.7265625²=2.98101806640625<3
[(1.7265625+1.734375)/2]²=1.73046875²=2.9945220947265625<3
解在1.73046875与1.734375之间
不知道你要精确到多少位