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①6.81+6.81×99                       
②0.25×185×40
③3.94+34.3×0.2                      
④3.6÷0.4-1.5×3
⑤2.08×(9.6÷2.4)÷4.8             
⑥68.1-77.7÷0.7×0.5.
分析:①可以运用乘法分配律简算;②可以运用乘法交换律简算;其余题目按照先算乘除,再算加减,有括号的先算扩号里面的运算顺序计算.
解答:解:①6.81+6.81×99,
=6.81×(1+99),
=6.81×100,
=681;

②0.25×185×40,
=0.25×40×185,
=10×185,
=1850;

③3.94+34.3×0.2,
=3.94+6.86,
=10.8;

④3.6÷0.4-1.5×3,
=9-4.5,
=4.5;

⑤2.08×(9.6÷2.4)÷4.8,
=2.08×4÷4.8,
=8.32÷4.8,
=1.7
?
3


⑥68.1-77.7÷0.7×0.5,
=68.1-111×0.5,
=68.1-55.5,
=12.6.
点评:本题考查了四则混合运算的计算法则,计算时要想看清楚能否运用简算的方法,若不能就按照运算顺序一步步求解.
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