据分析解答如下:
(1)27.3+73.2+72.7,
=27.3+72.7+73.2,
=100+73.2,
=173.2.
(2)43.25-10.4-3.25,
=43.25-3.25-10.4,
=40-10.4,
=29.6.
(3)3.8+1.37+6.2+12.63,
=(3.8+6.2)+(1.37+12.63),
=10+14,
=24.
(4)76.8-27.4-12.6,
=76.8-(27.4+12.6),
=76.8-40,
=36.8.
(5)5.85+1.89-2.85,
=5.85-2.85+1.89,
=3+1.89,
=4.89.
(6)3.9+0.1-3.9+0.1,
=(3.9-3.9)+(0.1+0.1),
=0.2.