分析:(1)(2)根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)便計(jì)算.
(3)根據(jù)加法交換律和加法結(jié)合律進(jìn)行簡(jiǎn)便計(jì)算.
(4)根據(jù)加法交換律進(jìn)行計(jì)算.
(5)根據(jù)加法交換律和減法的性質(zhì)進(jìn)行簡(jiǎn)便運(yùn)算.
解答:解:(1)35.27-(6.27+0.86)
=35.27-6.27-0.86
=29-0.86
=28.14;
(2)23.46-4.26-5.74
=23.46-(4.26+5.74)
=23.46-10
=13.46;
(3)15.42+8.7+1.3+4.58
=(15.42+4.58)+(8.7+1.3)
=20+10
=30;
(4)5.74+1.98+3.26
=5.74+3.26+1.98
=9+1.98
=10.98;
(5)7.85-2.3+4.15-4.7
=(7.85+4.15)-(2.3+4.7)
=12-7
=5.
點(diǎn)評(píng):本題主要考查了學(xué)生對(duì)整數(shù)運(yùn)算定律推廣到小數(shù)進(jìn)行簡(jiǎn)便計(jì)算的計(jì)算能力,熟記運(yùn)算定律是解答此類問(wèn)題的關(guān)鍵.