分析:(1)根據(jù)除以連續(xù)的兩個數(shù),就屬除以這兩個數(shù)的乘積,進(jìn)行簡算;
(2)把0.32拆成0.8×0.4,再根據(jù)乘法交換律和結(jié)合律進(jìn)行簡算;
(3)由積的不變規(guī)律,的把6.37×45=63.7×4.5,再根據(jù)乘法分配律進(jìn)行簡算;
(4)9999=10000-1,999=1000-1,99=100-1,9=10-1,然后再進(jìn)行簡算即可.
解答:解:(1)9.9÷0.125÷8,
=9.9÷(0.125×8),
=9.9÷1,
=9.9;
(2)1.25×0.32×2.5,
=1.25×(0.8×0.4)×2.5,
=(1.25×0.8)×(2.5×0.4),
=1×1,
=1;
(3)36.3×4.5+6.37×45,
=36.3×4.5+63.7×4.5,
=(36.3+63.7)×4.5,
=100×4.5,
=450;
(4)9999+999+99+9,
=(10000-1)+(1000-1)+(100-1)+(10-1),
=(10000+1000+100+10)-(1+1+1+1),
=11110-4,
=11106.
點評:根據(jù)題目給出的數(shù)據(jù),選擇合適的運算定律,然后進(jìn)行簡算即可.