分析:(1)运用乘法交换律简算;
(2)根据减法的性质简算;
(3)(8)运用乘法分配律简算;
(4)根据除法的性质简算;
(5)先把32分成4×8,再运用乘法结合律简算;
(6)先把102分成100+2,再运用乘法结合律简算;
(7)(9)运用加法交换律和结合律简算.
解答:解:(1)125×(73×8),
=125×8×73,
=1000×73,
=73000;
(2)25.23-7.85-1.15,
=25.23-(7.85+1.15),
=25.23-9,
=16.23;
(3)302×99+302,
=302×(99+1),
=302×100,
=30200;
(4)7200÷4÷25,
=7200÷(4×25),
=7200÷100,
=72;
(5)25×32×125,
=25×4×8×125,
=(25×4)×(8×125),
=100×1000,
=100000;
(6)45×102,
=45×(100+2),
=45×100+45×2,
=4500+90,
=4590;
(7)25+75-25+75,
=(25-25)+(75+75),
=0+150,
=150;
(8)312×4+188×4,
=(312+188)×4,
=500×4,
=2000;
(9)27.7+3.23+16.77+2.3,
=(27.7+2.3)+(3.23+16.77),
=30+20,
=50.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.