分析:(1)先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法;
(2)先算小括号里面的加法,再算括号外的乘法,最后算除法;
(3)先把99看成100-1,然后再用乘法分配律简算;
(4)、(5)、(8)运用乘法分配律简算;
(6)把8分解成2×4,然后使用乘法结合律简算;
(7)把32分解成8×4,然后使用乘法结合律简算.
解答:解:(1)420÷[(205-198)×4],
=420÷[7×4],
=420÷28,
=15;
(2)9×(16+60)÷12,
=9×76÷12,
=684÷12,
=57;
(3)99×45,
=(100-1)×45,
=100×45-45×1,
=4500-45,
=4455;
(4)47×15+43×15,
=(47+43)×15,
=90×15,
=1350;
(5)14×36+14×63+14,
=14×(36+63+1),
=14×100,
=1400;
(6)45×8×25,
=45×2×4×25,
=(45×2)×(4×25),
=90×100,
=9000;
(7)125×32×25,
=125×8×4×25,
=(125×8)×(4×25),
=1000×100,
=100000;
(8)(25+20)×4,
=25×4+20×4,
=100+80,
=180.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.