解:(1)486-198
=486-200+2,
=286+2,
=288;
(2)25×32×125
=(25×4)×(8×125),
=100×1000,
=100000;
(3)4.8×54+54×5.2
=(4.8+5.2)×54,
=10×54,
=540;
(4)37×101
=37×(100+1),
=37×100+37×1,
=3700+37,
=3737;
(5)25.25×4
=(25+0.25)×4,
=25×4+0.25×4,
=100+1,
=101;
(6)0.58+0.32+0.44+0.68
=(0.58+44)+(0.32+0.68),
=1.02+1,
=2.02.
分析:(1)可根据凑整法计算;
(2)可将32拆分为4×8后根据乘法结合律计算;
(3)可根据乘法分配律计算;
(4)可将101拆分为100+1后根据乘法分配律计算;
(5)可将25.25拆分为25+0.25后根据乘法分配律计算;
(6)可根加法交换律及结合律计算.
点评:完成本题要注意分析式中数据的特点及内在联系,然后运用合适的方法计算.