分析:(1)先將原式變形為27.3+72.7+73.2,再按照從左到右的順序計算即可;
(2)先將原式變形為43.25-3.25-10.4,再按照從左到右的順序計算即可;
(3)先將原式變形為(3.8+6.2)+(1.37+12.63),再逐級計算即可;
(4)先將原式變形為76.8-(27.4+12.6),再按照運(yùn)算順序計算即可;
(5)先將原式變形為5.85-2.85+1.89,再按照從左到右的順序計算即可;
(6)先將原式變形為(3.9-3.9)+(0.1+0.1),再按照運(yùn)算順序計算即可.
解答:解:據(jù)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.
點(diǎn)評:此類題目,應(yīng)依據(jù)題目特點(diǎn),靈活的選擇計算方法.