分析:(1)102=100+2,然后再根據(jù)乘法分配律進(jìn)行簡算;
(2)根據(jù)乘法結(jié)合律進(jìn)行簡算;
(3)先算除法,再算加法;
(4)根據(jù)除法的性質(zhì)進(jìn)行簡算;
(5)根據(jù)加法交換律和結(jié)合律進(jìn)行簡算;
(6)先算加法,再算減法,最后算乘法.
解答:解:
(1)5.4×102,
=5.4×(100+2),
=5.4×100+5.4×2,
=540+10.8,
=550.8;
(2)23.7×0.25×8,
=23.7×(0.25×8),
=23.7×2,
=47.4;
(3)4.2+3.6÷60,
=4.2+0.06,
=4.26;
(4)4.8÷0.24÷2,
=4.8÷(0.24×2),
=4.8÷0.48,
=10;
(5)0.7+3.9+4.3+6.1,
=(0.7+4.3)+(3.9+6.1),
=5+10,
=15;
(6)0.8×[13-(3.12+5.28)],
=0.8×[13-8.4],
=0.8×4.6,
=3.68.
點(diǎn)評:考查了運(yùn)算定律與簡便運(yùn)算,四則混合運(yùn)算.注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算律簡便計(jì)算.