分析:(1)可根據(jù)一個(gè)數(shù)減兩個(gè)數(shù)的和,等于用這個(gè)數(shù)分別減去這兩個(gè)數(shù)的減法性質(zhì)計(jì)算;
(3)根據(jù)加法交換律及結(jié)合律計(jì)算;
(5)可根據(jù)加法結(jié)合律計(jì)算;
(2)(4)(6)根據(jù)小數(shù)加法與減法的運(yùn)算法則計(jì)算即可.
解答:解:(1)12.65-(3.65+8.5)
=12.65-3.65-8.5,
=9-8.5,
=0.5;
(2)7.8+9+7.8
=16.8+7.8,
=24.6;
(3)4.82-0.25+1.25+0.25
=4.82+(1.25-0.25)+0.25,
=4.82+1+0.25,
=5.82+0.25,
=6.07;
(4)9.99-4.8=5.19;
(5)1.36+6.7+4.3
=1.36+(6.7+4.3),
=1.36+11,
=12.36;
(6)1.36-1.36+25.2
=0+25.2,
=25.2.
點(diǎn)評(píng):在完成脫式計(jì)算時(shí),要注意計(jì)算過(guò)程的完整性,中間不要有太大跳躍.