解:①(125+9)×8,
=125×8+9×8,
=1000+72,
=1072;
②11.84-7.96-3.04,
=11.84-(7.96+3.04),
=11.84-11,
=0.84;
③(124-85)×6÷26,
=39×6÷26,
=234÷26,
=9;
④125×72×4,
=(125×8)×(9×4),
=1000×36,
=36000;
⑤49.62+27.17-19.62,
=49.62-19.62+27.17,
=30++27.17,
=57.17;
⑥3.27+6.4+2.73+4.6,
=(3.27++2.73)+(6.4+4.6),
=6+11,
=17.
分析:①(125+9)×8利用乘法的分配律計(jì)算簡(jiǎn)便;
②11.84-7.96-3.04利用一個(gè)數(shù)連續(xù)減去兩個(gè)數(shù)等于這個(gè)數(shù)減去這兩個(gè)數(shù)的和計(jì)算簡(jiǎn)便;
③(124-85)×6÷26按四則混合運(yùn)算運(yùn)算順序先做(124-85),在做乘,最后算除;
④把72變成8×9,125×72×4利用乘法的交換律和結(jié)合律變成(125×8)×(9×4)計(jì)算簡(jiǎn)便;
⑤49.62+27.17-19.62利用加法的交換律和結(jié)合律變成49.62-19.62+27.17;
⑥3.27+6.4+2.73+4.6利用加法的交換律和結(jié)合律變成(3.27++2.73)+(6.4+4.6)計(jì)算簡(jiǎn)便.
點(diǎn)評(píng):考查了運(yùn)算定律與簡(jiǎn)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(jiǎn)便計(jì)算.