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算簡便;
②11.84-7.96-3.04利用一個數(shù)連續(xù)減去兩個數(shù)等于這個數(shù)減去這兩個數(shù)的和計算簡便;
③(124-85)×6÷26按四則混合運算運算順序先做(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合律變成(125×8)×(9×4)計算簡便;
⑤49.62+27.17-19.62利用加法的交換律和結合律變成49.62-19.62+27.17;
⑥3.27+6.4+2.73+4.6利用加法的交換律和結合律變成(3.27++2.73)+(6.4+4.6)計算簡便.
點評:考查了運算定律與簡便運算,四則混合運算.注意運算順序和運算法則,靈活運用所學的運算律簡便計算.